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NuDAQ
ACL-8111
16-bit High Resolution
Data Acquisition Card
User’s Guide
@Copyright 1995~2000 ADLINK Technology Inc.
All Rights Reserved.
Manual Rev. 2.43: April 15, 2000
The information in this document is subject to change without prior notice in order to improve reliability, design and function and does not represent a commitment on the part of the manufacturer.
In no event will the manufacturer be liable for direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the product or documentation, even if advised of the possibility of such damages.
This document contains proprietary information protected by copyright. All rights are reserved. No part of this manual may be reproduced by any mechanical, electronic, or other means in any form without prior written permission of the manufacturer.
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NuDAQ is a registered trademark of ADLINK Technology Inc.,
Other product names mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies.
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Table of Contents
How to Use This Guide..................................................................... 1
Chapter 1 Introduction .................................................................. 1
1.1
Features.............................................................................. 1
1.2
Applications........................................................................ 2
1.3
Specifications..................................................................... 2
1.4
Software Supporting........................................................... 5
1.4.1
ACLS-DLL2 .......................................................................................5
1.4.2
ACLS-LVIEW ....................................................................................5
Chapter 2 Installation .................................................................... 7
2.1
Unpacking........................................................................... 7
2.2
What You Have ................................................................... 8
2.3
PCB Layout......................................................................... 8
2.4
Base Address Setting........................................................ 10
2.5
D/A Reference Voltage Setting ......................................... 11
2.6
Connectors Pin Assignments............................................. 13
2.7
Daughter Board Connection ............................................. 15
2.7.1
Connect with ACLD-9137 ...........................................................15
2.7.2
Connect with ACLD-9182 ...........................................................15
2.7.3
Connect with ACLD-9185 ...........................................................15
2.7.4
Connect with ACLD-9188 ...........................................................16
Chapter 3 Registers Format ......................................................... 17
3.1
Registers Address Map...................................................... 17
3.2
A/D Data Registers............................................................ 18
3.3
A/D Channel Multiplexer Register..................................... 18
3.4
A/D Input Range Control Register..................................... 19
3.5
Mode and Interrupt Control Register................................. 21
3.6.
Interrupt Status Register................................................... 22
3.7
Software Trigger Register................................................. 22
3.8
Digital I/O register............................................................. 22
3.9
D/A Output Register .......................................................... 23
Chapter 4 Operation Theorem...................................................... 25
4.1
A/D Conversion ................................................................. 25
4.1.1
A/D Conversion Procedure ........................................................25
4.1.2
A/D Clock Sources (Trigger Modes) ........................................26
4.1.3
A/D Data Transfer Modes ...........................................................27
Contents • i
4.2
D/A Conversion ................................................................. 28
4.3
Digital Input and Output.................................................... 30
Chapter 5 C/C++ Library for DOS................................................. 33
5.1
DOS Software Library Installation .................................... 33
5.1.1
Installation.......................................................................................33
5.1.2
Running Utility................................................................................33
5.1.3
Example Programs.......................................................................34
5.2
_8111_Initial...................................................................... 34
5.3
_8111_Switch_Card_No..................................................... 36
5.4
_8111_DI............................................................................ 37
5.5
_8111_DI _Channel............................................................ 38
5.6
_8111_DO .......................................................................... 39
5.7
_8111_DA .......................................................................... 40
5.8
_8111_AD_Set_Channel .................................................... 41
5.9
_8111_AD_Set_Gain .......................................................... 42
5.10
_8111_AD_Set_Mode ......................................................... 43
5.11
_8111_AD_Soft_Trig .......................................................... 45
5.12
_8111_AD_Aquire .............................................................. 45
5.13
_8111_CLR_IRQ................................................................. 46
5.14
_8111_AD_INT_Start .......................................................... 46
5.15
_8111_AD_INT_Status........................................................ 49
5.16
_8111_AD_INT_Stop .......................................................... 49
5.17
_8111_AD_Timer ............................................................... 50
Chapter 6 Calibration................................................................... 51
6.1
What do you need ............................................................ 51
6.2
VR Assignments................................................................ 53
6.3
D/A Calibration ................................................................. 53
6.4
A/D Calibration ................................................................. 54
Appendix A. Demo. Programs........................................................ 55
Product Warranty/Service............................................................. 57 ii • Contents
How to Use This Guide
This manual is designed to help you use the ACL-8111. The manual describes how to modify various settings on the ACL-8111 card to meet your requirements. It is divided into six chapters:
•
Chapter 1, "Introduction," gives an overview of the product features, applications, and specifications.
•
Chapter 2, "Installation," describes how to install the ACL-
8111. The PCB layout is shown, the switch setting for base address, and jumper setting for analog input channel configuration, reference voltage setting are specified. The connectors' pin assignment and how to connect the outside signal are described.
•
Chapter 3, "Registers format," describes the details of register format and structure of the ACL-8111, this information is very important for the programmers who want to control the hardware by low-level programming.
•
Chapter 4, "Operation Theorem" describes how to operate the ACL-8216. The A/D, D/A, DIO and timer/counter functions are introduced. Also, some programming concepts are specified.
•
Chapter 5, "C/C++ Library," describes the C++ Library for
DOS environment.
•
Chapter 6, "Calibration and utilities," describes how to calibrate the ACL-8111 for accurate measurement.
How to use this guide • 1
1
Introduction
The ACL-8111 is a multi -function, high performance, and generalpurpose data acquisition card for the IBM Personal Computer and compatible computers. The registers map is fully compatible with
PCL-711B.
The ACL-8111 is designed to combine all the data acquisition functions, such A/D, D/A, D/O, and D/I in a single board, The highend specifications of the card makes it ideal for wide range of applications in industrial and laboratory automation.
1.1 Features
The ACL-8111 Enhanced Multi -function Data Acquisition Card provides the following advanced features:
•
8 single-ended 12-bit analog input channels
•
On-chip sample & hold
•
Variable input range:
± 5V, ±2.5V, ±1.25V, ±0.625V, and ±
0.3125V
•
One 12-bit monolithic multiplying analog output channel
•
16 digital output channels
•
16 digital input channels
•
Three A/D trigger modes: Software trigger, Programmable pacer and external trigger
•
Programmable IRQ level for A/D data transfer
•
Rugged 37-pin D-sub connector
•
Compact size PCB
Introduction • 1
1.2 Applications
•
Industrial and laboratory ON/OFF control
•
Energy management
•
Annunciation
•
16 TTL/DTL compatible digital input channels
•
Security controller
•
Product test
•
Period and pulse width measurement
•
Event and frequency counting
•
Waveform and pulse generation
1.3 Specifications
♦ Analog Input (A/D)
•
Converter: ADS-774 or equivalent one, successive approximation type
•
Resolution: 12-bit
•
Number of channels: 8 single-ended
•
Programmable Gain: 1, 2, 4, 8, 16 (programmable)
•
Input Range: (programmable)
Bipolar : ±5V, ± 2.5V, ±1.25V, ±0.625V, and ±0.3125V
•
Conversion Time: 8
µ sec
•
Maximum Sampling Rate: > 50KHz
•
Over-voltage protection: Continuous
± 35V maximum
•
Accuracy: 0.015% of reading
± 1 Bit LSB
•
Input Impedance: 10 M
Ω
•
AD Clock Sources (trigger modes): Software trigger, internal timer pacer, and external pulse trigger
•
Data Transfer Modes: Polling and Interrupt
♦ Analog Output (D/A)
•
Converter: DAC7548 or equivalent, monolithic multiplying
•
Number of channel: 1 double-buffered analog outputs
•
Resolution: 12-bit
2 • Introduction
•
Output Range:
Internal reference: (unipolar) 0~5V or 0~10V
External reference: (unipolar) max. +10V or -10V
•
Settling Time: 30
µ sec
•
Linearity:
±1/2 bit LSB
•
Output driving capability:
±5mA max.
♦
Digital I/O (DIO)
•
Number of channel: 16 DI & 16 DO (TTL compatible)
•
Input Voltage:
Low: Min. 0V; Max. 0.8V
High: Min. +2.0V
•
Input Load:
Low: +0.5V @ -0.2mA max.
High: +2.7V @+20 uA max.
•
Output Voltage:
Low: Min. 0V; Max. 0.4V
High: Min. +2.4V
•
Output Driving Capacity:
Low: Max. +0.5V at 8.0mA (Sink)
High: Min. 2.7V at 0.4mA(Source)
♦
Programmable Counter
•
Device: 82C54
•
A/D pacer Source: 32-bit timer (two 16-bit counter cascaded together) with a 2MHz time base
•
Pacer Output: 0.00046 Hz ~ 100K Hz
♦
General Specifications
•
I/O Base Address: 16 consecutive address location
•
Interrupt IRQ: IRQ 2,3,4,5,6,7 (programmable)
•
Connector: 37-pin D-type connector
•
Operating Temperature: 0
°C ~ 55°C
•
Storage Temperature: -20
°C ~ 80°C
•
Humidity: 5 ~ 95%, non-condensing
•
Power Consumption:
+5 V @ 440 mA typical
Introduction • 3
+12V @ 60 mA typical
•
Dimension: 158mm X 108mm
4 • Introduction
1.4 Software Supporting
The ACL-8111 is programmed using simple 8 -bit I/O port commands. Users can use high level language, such as BASIC, C, or PASCAL, or low- level language, such as assembly to program the board. For the programming under Windows or LabView, please contact your dealer to purchase ACLS-DLL2 or ACLD-LVIEW.
1.4.1 ACLS-DLL2
For easily program the board under Windows environment, we also provide ACLS-DLL2, which include the DLL for Windows 95/98/NT.
With ACLS-DLL2, you can use compilers such as VB, VC/C++, or
Delphi. ACLS-DLL2 is included in ADLINK CD. It need license.
1.4.2 ACLS-LVIEW
For easily link the ACL-8111 with LabView of National Instrument, the
ACLS-LVIEW includes the Vis of the ACL-8111 under for Windows
3.1/95/98 and NT. ACLS-LVIEW is included in ADLINK CD. It need license.
Introduction • 5
2
Installation
This chapter describes how to install the ACL-8111. The following list shows the installation procedures:
1. Unpacking and check what you have
2. Check the PCB and the location of jumper and switch
3. Setup the jumpers according to the system and applications setting
4. Installation the external termination boards
5. Wiring with signals according to the connector pin assignments
2.1 Unpacking
The ACL-8111 card contains sensitive electronic components that can be easily damaged by static electricity.
The card should be done on a grounded anti -static mat. The operator should be wearing an anti-static wristband, grounded at the same point as the anti -static mat.
Inspect the card module carton for obvious damage. Shipping and handling may cause damage to your module. Be sure there are no shipping and handing damages on the module before p rocessing.
After opening the card module carton, extract the system module and place it only on a grounded anti -static surface component side up.
Again inspect the module for damage. Press down on all the socketed
IC's to make sure that they are properly seated. Do this only with the module place on a firm flat surface.
Note: DO NOT APPLY POWER TO THE CARD IF IT HAS BEEN
DAMAGED.
Installation • 7
You are now ready to install your ACL-8111.
2.2 What You Have
In addition to this User's Manual, the package includes the following items:
•
ACL-8111 multi-function data acquisition card
•
ADLINK Software CD
If any of these items is missing or damaged, contact the dealer from whom you purchased the product. Save the shipping materials and carton in case you want to ship or store the product in the future.
2.3 PCB Layout
In ACL-8111, there are three connectors (CN1~CN3), one switch
(SW1), one jumper (JP1) and 5 variable resistors (VR1~VR5).
Please refe r Figure 2.3 to identify the location these components.
The card's jumpers and switches are preset at the factory. Please setup the switch and jumper according to the system setting and the application requirements.
A jumper is closed (sometimes referred to as "shorted") with the plastic cap inserted over two pins of the jumper. A jumper is open with the plastic cap inserted over one or no pin(s) of the jumper.
8 • Installation
Figure 2.3 ACL-8111‘s PCB layout
Installation • 9
2.4 Base Address Setting
The ACL-8111 requires 16 consecutive address locations in I/O address space. The base address of the ACL-8111 is restricted by the following conditions.
1. The base address must be within the range Hex 200 to Hex
3FF.
2. The base address should not conflict with any PC reserved I/O address. See Appendix A.
3. The base address must not conflict with any add-on card on your own PC. Please check your PC before installing the ACL-
8111.
The ACL-8111's base address is selected by a 6 position DIP switch
SW1. The default setting of base address is set to be HEX 220. All possible base address combinations are listed as Table 2.2. You may modify the base address if the address HEX 220 has been occupied by another add-on card.
SW1 : Base Address = Hex 220
O N DIP
1 2 3 4 5 6
A ( 9 8 7 6 5 4 )
Figure 2.4 Default Base Address Setti ng
I/O port address(Hex)
000-00F
100-10F
:
200-20F
210-21F
220-22F
(default)
:
1
A9
ON
(0)
ON
(0)
OFF
(1)
OFF
(1)
OFF
(1)
2
A8
ON
(0)
OFF
(1)
ON
(0)
ON
(0)
ON
(0)
3
A7
ON
(0)
ON
(0)
ON
(0)
ON
(0)
ON
(0)
4
A6
ON
(0)
ON
(0)
ON
(0)
ON
(0)
ON
(0)
5
A5
ON
(0)
ON
(0)
ON
(0)
ON
(0)
OFF
(1)
6
A4
ON
(0)
ON
(0)
ON
(0)
OFF
(0)
ON
(0)
10 • Installation
300-30F
3F0-3FF
OFF
(1)
OFF
(1)
OFF
(1)
OFF
(1)
ON
(0)
OFF
(1)
ON
(0)
OFF
(1)
ON: 0 OFF: 1.
A4 ... A9 are correspond to PC address lines.
How to Define a Base Address for the ACL-8111?
ON
(0)
OFF
(01
The DIP1 to DIP6 in the switch SW1are one to one corresponding to the PC bus address line A9 to A4. A0, A1, A2, and A3 are always 0. If you want to change the base address, you can only change the values of A9 to A4 (shadow area of below table). The following table is an example, which shows you how to define the base address as Hex 220.
Base Address: Hex 220
ON
(0)
OFF
(1)
2 2 0
1 0 0 0 1 0 0 0 0 0
A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
2.5 D/A Reference Voltage Setting
The analog output range of ACL-8111 depends on the reference voltage, which is selected by JP1. There are two range of reference voltages can be assigned as either -5V or -10V, that will generate output range 0V ~ +5V or 0V ~ +10V, respectively.
The setting of D/A reference voltage is specified as following:
When you select -10V for the D/A reference voltage, you should be very careful the analog output. Because the -10 V voltage source is supplied from your PC system, and it may be up to 11.5V only.
Therefore, it will cause you analog output is less than +10V.
Reference
Voltage is -5V
(default)
Reference
Voltage is -10V
JP1 h h h
JP1 h h h
Installation • 11
12 • Installation
2.6 Connectors Pin Assignments
The ACL-8111 has three connectors: one 37-pin D-type connector
(CN1) and two 20-pin insulation displacement connectors (CN2 and
CN3).
CN1 is for analog input and analog output signals. CN2 is for digital input signal. CN3 is for digital output signal. The pin assignments for each connector are illustrated in the Figure 3.1 ~ Figure 3.3.
•
CN1: Analog input/output
AI0 (1)
AI1 (2)
AI2 (3)
AI3 (4)
AI4
AI5
(5)
(6)
AI6 (7)
AI7 (8)
--
--
(9)
-(10)
(11)
-(12)
--
--
(13)
(14)
DGND (15)
-(16)
-(17)
-(18)
+5V (19)
(20)
(21)
(22)
(23)
AGND
AGND
AGND
AGND
(24)
(25)
AGND
AGND
(26)
(27)
AGND
AGND
(28)
(29)
(30)
(31)
--
--
AO1
--
(32) --
(33)
(34)
--
--
(35)
(36)
--
--
(37) --
Figure 3.1. Pin Assignment of CN1
Legend:
AIn
AO
: Analog Input Channel n (single-ended)
: Analog Output Channel
A.GND : Analog Ground
D.GND : Ground
+5V : +5V from system power supply
Installation • 13
•
CN 2: Digital Input Signals (DI 0 - 15)
CN2
DI 0
DI 2
DI 4
DI 6
DI 8
DI 10
DI 12
DI 14
GND
+5V
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
DI 1
DI 3
DI 5
DI 7
DI 9
DI 11
DI 13
DI 15
GND
Strobe
•
CN 3: Digital Output Signals (DO 0 - 15)
CN3
DO 0
DO 2
DO 4
DO 6
DO 8
DO 10
DO 12
DO 14
GND
+5V
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
DO 1
DO 3
DO 5
DO 7
DO 9
DO 11
DO 13
DO 15
GND
+12V
Legend:
DO n
DI n
GND
+12V
: Digital output signal channel n
: Digital input signal channel n
: Digital ground
: +12V power from system
Strobe : Digital input strobe signal
14 • Installation
2.7 Daughter Board Connection
The ACL-8111 can be connected with five different daughter boards
ACLD-9137, 9182, 9185, and 9188. The functionality and connections are specified as following:
2.7.1 Connect with ACLD-9137
The ACLD-9137 is a direct connector for the card, which is equipped with 37-pin D-sub connector. This board provides a simple way for connection. It is very suitable for the simple applications that do not need complex signal condition before the A/D conversion is performed.
2.7.2 Connect with ACLD-9182
The ACLD-9182 is a 16 channel isolated digital input board. This board is connected with CN2 of ACL-8111 via 20-pin flat cable. The advantage of this board is a 500Vdc isolation voltage is provided, and it can protect your PC system from damage when an abnormal input signal is occurred.
2.7.3 Connect with ACLD-9185
The ACLD-9185 is a 16 channel SPDT relay output board. This board is connected with CN3 of ACL-8111 via 20-pin flat cable. By using this board, you can control outside device through the digital output signals.
ACLD-9185
ACLD-9182
CN3
CN2
ACL-8111
Installation • 15
2.7.4 Connect with ACLD-9188
ACLD-9188 is a general-purpose terminal board for the entire card, which comes equipped w ith 37-pin D-sub connector.
CN3
CN1
CN2
ACLD-9188
ACL-8111
16 • Installation
3
Registers Format
The chapter specifies the detailed descriptions of the register format.
This information is useful for the programmers who wish to handle the card by low-level program.
3.1 Registers Address Map
The ACL-8111 requires 16 consecutive addresses in the I/O address space. The following table (Table 3.1) shows the location of each register relative to the base address and register descriptions.
Address
Base + 0
Base + 1
Base + 2
Base + 3
Base + 4
Base + 5
Base + 6
Base + 7
Base + 8
Base + 9
Base + 10
Base + 11
Base + 12
Base + 13
Base + 14
Base + 15
Read
Counter 0
Counter 1
Counter 2
Not Used
A/D low byte
A/D high byte
DI low byte
DI high byte
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
Write
Counter 0
Counter 1
Counter 2
Counter Control
D/A low byte
D/A high byte
Not Used
Not Used
Clear Interrupt Request
Gain Control
Multiplexer Scan Control
Mode Control
Software A/D trigger
DO low byte
DO high byte
Not Used
Table 3.1 I/O Port Address Map
Registers Format • 17
3.2 A/D Data Registers
ACL-8111 provides 8 single-end A/D input channels. The 12 bit A/D data is put in two 8 -bit registers. The low byte date (8 LSBs) is at address BASE+4 and the high byte data (4 MSBs) is at address
BASE+5. The DRDY bit is used to indicate the status of A/D conversion. DRDY goes to low-level means A/D conversion is completed.
Address : BASE + 4 and BASE + 5
Attribute: read only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+4 AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
BASE+5 0 0 0 DRDY AD11 AD10 AD9 AD8
AD11. AD0: Analog to digital data. AD11 is the Most Significant Bit
(MSB). AD0 is the Least Significant Bit (LSB).
DRDY: Data Ready Signal.
1: A/D data is not ready
0: A/D conversion is completed.
It will be set to 1 after reading out the low byte data
3.3 A/D Channel Multiplexer Register
This register is used to control the A/D channels number to convert.
It's a write only register. When the channel number is written to the register, the multiplexer switches to the new channel and waits for conversion.
Address : BASE + 10
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+10 X X X
CLn: multiplexer channel number.
X X CL2 CL1 CL0
18 • Registers Format
CL2 is MSB, and CL0 is LSB.
Where CL2, CL1, and CL0 are multiplexer channel selection:
Channel NO. CL2 CL1 CL0
Power Up Setting
4
5
6
7
0
1
2
3
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
3.4 A/D Input Range Control Register
The gain control register is a write -only register using address Base
+ 9. It is used to adjust the gain of the analog input programmable amplifier. The data format is specified as follows:
Address : BASE + 9
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+9
G2
0
0
0
0
1
1
1
1
G1
0
0
1
1
0
0
1
1
X X X
Where G2, G1, and G0 are Gain selection:
G0
0
1
0
1
0
1
0
1
GAIN x1 x2 x4 x8 x16
Invalid
Invalid
Invalid
X
X
X
X G2
Input Range (V)
±
5V
±
2.5V
±
1.25V
±
0.625V
±
0.3125V
X
G1 G0
Power Up Setting
The relationship between input voltage range, maximum input voltage and gain is specified as the equation:
Registers Format • 19
Analog Input Range = Maximum Input Voltage / Gain
20 • Registers Format
3.5 Mode and Interrupt Control Register
The Mode and Interrupt control register is a write -only register. This register control the AD operating modes and the IRQ level of the
ACL-8111. The AD operation modes include the AD clock source and the AD data transfer method.
Address : BASE + 11
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+11 X IR2 IR1 IR0
Where M0, M1, and M2 are mode selection:
X M2 M1 M0
M2 M1 M0
0 0 0
Description
Software trigger with program polling
0
0
0
0
1
1
1
0
(No interrupt generated)
External trigger with program polling
1
1
1
0
0
1
1 External trigger with interrupt polling
(With End-of-conversion “EOC” interrupt)
0 Internal time pacer trigger and polling
(No interrupt generating)
1 Not Used
1 1
0 Internal timer pacer trigger with interrupt data transfer
(With End-of-conversion “EOC” interrupt)
1 Not Used
Note: The external trigger signal comes from the DI 0 (pin-1 of CN2).
Where IR0, IR1, and IR2 are interrupt IRQ level settings:
0
1
1
1
IR2 IR1 IR0
0 0 0
0
0
0
1
1
0
1
0
0
1
1
0
1
0
IRQ Level
IRQ2
Not Used
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
Registers Format • 21
1 1 1 IRQ7
3.6. Interrupt Status Register
The Interrupt Status Register is used to clear the interrupt status for next new interrupt can be generated. If the ACL-8111 is in interrupt data transfer mode, a hardware status flag will be set after each A/D conversion. You have to clear the status flag by just writing any data to this register, let the ACL-8111 can generate next interrupt if a new A/D conversion is happen.
Address : BASE + 8
Attribute: write only
Data Format:
Bit 7
BASE+8 X
6
X
5
X
4
X
3
X
2
X
1
X
0
X
3.7 Software Trigger Register
If you want to generate a trigger pulse to the ACL-8111 for A/D conversion, you just write any data to this register, and then the A/D converter will be triggered.
Address : BASE + 12
Attribute: write only
Data Format:
Bit 7
BASE+12 X
6
X
5
X
4
X
3
X
2
X
1
X
0
X
3.8 Digital I/O register
There are 16 digital input channels and 16 digital output channels are provided by the ACL-8111. The address Base + 6 and Base + 7 are used for digital input channels, and the address Base + 13 and Base
+ 14 are used for digital output channels.
Address : BASE + 6 & BASE + 7
Attribute: read only
22 • Registers Format
Data Format:
Bit 7 6 5 4 3 2 1 0
Base + 6 DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
Base + 7 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8
Address : BASE + 13 & BASE + 14
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
Base + 13 DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
Base + 14 DO15 DO14 DO13 DO12 DO11 DO10 DO9 DO8
3.9 D/A Output Register
The D/A converter will convert the D/A output register data to the analog signal. The register data of the address Base + 4 and Base
+ 5 are used for D/A conversion.
Address : BASE + 4 & BASE + 5
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
Base + 4 DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0
Base + 5 X X X X DA11 DA10 DA9 DA8
DA0 is the LSB and DA11 is the MSB of the 12 bit data.
X: don't care
Note: The D/A registers are "double buffered" so that the D/A analog output signals will not updated until the second (high) byte is written. This can insure a single step transition when the D/A conversion.
Registers Format • 23
4
Operation Theorem
The chapter describe the operation theorem of ACL-8111. The functions include the A/D conversion, D/A conversion, and digital I/O.
The operation theorem can help you to understand how to manipulate and to program the ACL-8111.
4.1 A/D Conversion
Before programming the ACL-8111 to perform the A/D conversion, you should understand the following issues:
•
A/D conversion procedure
•
A/D trigger mode
•
A/D data transfer mode
•
Signal Connection
4.1.1 A/D Conversion Procedure
The A/D conversion is starting by a trigger source, then the A/D converter will start to convert the signal to a digita l value. The ACL-
8111 provides three trigger modes, see section 4.1.2.
While A/D conversion, the DRDY bit in A/D data register is cleared to indicate the data is not ready. After conversion being completed, the
DRDY bit will return to high (1) level. It means users can read the converted data from the A/D data registers. Please refer section 3.2 for the A/D data format.
The A/D data should be transferred into PC's memory for further using.
The ACL-8111 provides three data transfer modes that allow users to
Operation Theorem • 25
optimize the DAS system. Refer to section 4.1.3 for data transfer modes.
4.1.2 A/D Clock Sources (Trigger Modes)
In the ACL-8111, two Internal or one external clock sources can trigger
A/D conversion. The two internal sources are the software trigger and the timer pacer trigger, which is controlled by the A/D operation mode control register (BASE+11). The A/D operation modes combine the AD clock sources and the data transfer mode together. Please also refer to the next section for detail data transfer modes. The available operation modes include:
•
Software trigger and software polling transfer
•
Internal timer pacer and interrupt transfer
•
Internal timer pacer and software polling transfer
•
External trigger and interrupt transfer
•
External trigger and software polling transfer
Three AD clock sources (or trigger sources) are available in the ACL-
8111.
Software trigger
The trigger source is software controllable in this mode. That is, the
A/D conversion is starting when any value is written into the software trigger register (BASE+12). Under this mode, the timing of the A/D conversion is fully controlled by software, it is suitable for low speed
A/D conversion. However, it is difficult to control the fixed A/D conversion rate except a timer interrupt service routine is used and the software trigger is programmed inside the interrupt service routines.
Timer Pacer Trigger
An on-board timer / counter chip 8253 provide a pacer trigger source at a fixed rate. Two counters of the 8253 chip are cascaded together to generate trigger pulse with precise frequency. It's recommend to use this mode if your applications need a fixed and precise A/D sampling rate. It can be combined with the EOC (end-of-conversion) interrupt data transfer.
On the ACL-8111, the 8253 chip for timer pacer trigger source is configured as below:
The pacer rate of above configuration is determined by the formula:
26 • Operation Theorem
Pacer rate = 2 MHz / (C1 * C2)
8253 Timer/Counter
Not Used
CLK0
Counter 0
GATE0 OUT0
Vcc
CLK1
GATE1
Counter 1
OUT1 Timer Pacer
2MHz
Oscillator
CLK2
GATE2
Counter 2
OUT2
The maximum pacer signal rate is 2MHz/4=500K, which excess the maximum A/D conversion rate of the ACL-8111. The minimum signal rate is 2MHz/65535/65535, which is a very slow frequency that user may never use it.
For example, if you wish to get a pacer rate 2.5 kHz, you can set C1 =
40 and C2 = 10. That is
2.5KHz = 2Mhz / (40 x 20)
External Trigger
Through the pin-1 of CN2 (DI0), the A/D conversion also can be performed when a rising edge of external signal is occurred. The conversion rate of this mode is more flexible than the previous two modes, because the users can handle the external signal by outside device. The external trigger can combine with the interrupt data transfer, or even program polling data transfer. Generally, the interrupt data transfer is often used when external trigger mode is used.
4.1.3 A/D Data Transfer Modes
On the ACL-8111, three A/D data transfer modes can be used when the conversion is completed. The data transfer mode is controlled by the mode control register (BASE+11). The different transfer modes are specified as follows:
Operation Theorem • 27
Software Data Transfer
Usually, this mode is used with software A/D trigger mode. After the
A/D conversion is triggered by software, the software should poll the
DRDY bit until it becomes to high level. Whenever the low byte of A/D data is read, the DRDY bit will be cleared to indicate the data is read out.
It is possible to read A/D converted data without polling. The A/D conversion time will not excess 8
µ s on ACL-8111 card. Hence, after software trigger, the software can wait for at least 25
µ s then read the
A/D register without polling.
EOC Interrupt Transfer
The ACL-8111 provides hardware interrupt capability. Under this mode, an interrupt signal is generated at end of A/D conversion (EOC) then the data is ready to be read. It is useful to combine the interrupt transfer with the timer pacer trigger mode. Under this mode, the data transfer is essenti ally asynchronous with the control software.
When the interrupt transfer is used, you have to set the interrupt IRQ level by hardware jumper. Please refer section 2.10 for IRQ jumper setting. After the A/D conversion is completed, a hardware interrupt will be inserted and its corresponding ISR (Interrupt Service Routine) will be invoked and executed. The converted data is transferred by the ISR program.
4.2 D/A Conversion
The operation of D/A conversion is simpler than A/D operation. You only need to write digital values into the D/A data registers and the corresponding voltage will be output from the AO. The ACL-8111 has one uni-polar analog output channels. To make the D/A output connections from the appropriate D/A output, please refer Figure 4.2.
28 • Operation Theorem
-5 or -10
INT or Ext
Ref In
D/A Converter -
+
Pin-30 ( AO)
To D/A Output
Pin-20 ( A.GND)
Analog GND
Figure 4.2 Connection of Analog Output Connection
The mathematical relationship between the digital number DAn and the output voltage is formulated as following:
Operation Theorem • 29
Vout
= −
Vref
×
DAn
4096
Where the Vref is the reference voltage, the Vout is the output voltage, and the DAn is the digital value in D/A data registers.
Before performing the D/A conversion, users should care about the
D/A reference voltage, which set by the JP1. Please refer section 2.6 for jumper setting. The reference voltage will effect the output voltage.
If the reference voltage is -5V, the D/A output scaling will be 0~5V. If the reference voltage is -10V, the D/A output scaling will be 0~10V. The relationship of reference voltage and output range is summary in the following table.
Reference Voltage
-5 V
-10 V
DA Output Voltage Range
0V ~ +5V
0V ~ +10V
Note that the D/A registers are "double buffered", so that the D/A analog output signals will not be updated until the high byte is written.
When write 12 bits data to D/A registers of the ACL-8111, the low byte must be written before the high byte. This procedure can insure a single step transition when the D/A conversion.
Note: when writing digital data to D/A register, the low byte data should
be written first, because the register will temporarily hold and not released to output. After the high byte is written, both high and low will add and passed to A/D converter.
4.3 Digital Input and Output
The ACL-8111 provides 16 digital input and 16 digital output channels through the connector CN2 and CN3 on board. The digital I/O signal are fully TTL/DTL compatible. The detailed digital I/O signal specification can be referred in section 1.3.
30 • Operation Theorem
74LS244
74LS373
Digital Input(DI)
From TTL Signal
Digital Output (DO)
To TTL Devices
Digital GND (DGND)
ACL-8111
Outside Device
Figure 4.3 Digital I/O Connection
To program digital I/O operation is fairly straightforward. The digital input operation is just to read data from the corresponding registers, and the digital output operation is to write data to the corresponding registers. Note that the DIO data channel can only be read or written in form of 8 bits together. It is impossible to access individual bit channel.
Operation Theorem • 31
5
C/C++ Library for DOS
This chapter describes the DOS software library, which is free supplied. The DOS library software includes a utility program, C language library, and some demonstration programs, which can help you reduce the programming work.
To program in Windows environment, please use ACLS-DLL2. The function reference manual of ACLS-DLL2 is included in the ADLINK
CD. It needs license.
5.1 DOS Software Library Installation
5.1.1 Installation
To install the DOS library software and utilities, please follow the following installation procedures:
1. Put ADLINK CD into the appropriate CD-ROM drive.
2. Type the following commands to change to the card’s directory
(X indicates the CD-ROM drive):
X:\>CD \NuDAQISA\8111
3. Execute the setup batch program to install the software:
X:\NuDAQISA\8111>SETUP
5.1.2 Running Utility
After finishing the installation, you can execute the utility by typing as follows:
C>cd ADLINK\8111\DOS\UTIL
C>8111UTIL
C/C++ Library for DOS
• 33
5.1.3 Example Programs
Six example programs in C language are supported in the directory
<SAMPLES>, you can refer these samples and modify them for your own application. They can help you understa nd the library more quickly.
5.2 _8111_Initial
@ Description
An ACL-8111 card is initialized according to the card number and the corresponding base address. Every ACL-8111 Multi-Function Data
Acquisition Card have to be initialized by this function before calling other functions.
@ Syntax int _8111_Initial(int card_number, int base_addresss )
@ Argument: two cards can be initialized, the card number must be CARD_1 or CARD_2. base_address: the I/O port base address of the card, the default address on the hardware setting
@ Return Code: is Hex 220.
ERR_NoError
ERR_InvalidBoardNumber
ERR_BaseAddressError
@ Example:
#include "8111.h" main()
{
Errcode = _8111_Initial( CARD_1, 0x210 );
if ( ErrCode != ERR_NoError ) exit(0);
ErrCode = _8111_Initial( CARD_2, 0x220 );
if ( ErrCode != ERR_NoError ) exit(0);
...
}
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• C/C++ Library for DOS
C/C++ Library for DOS
• 35
5.3 _8111_Switch_Card_No
@ Description
This function is used on dual-cards system. After two ACL-8111 cards are initialized by the initial function, you can select one card which you want to operate.
@ Syntax int _8111_Switch_Card_No(int card_number)
@ Argument: two cards can be initialized, the card number must be CARD_1 or CARD_2.
@ Return Code:
ERR_NoError
ERR_InvalidBoardNumber
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
}
_8111_Initial( CARD_1, 0x210 );
_8111_Initial( CARD_2, 0x220 );
/* Assume NoError when Initialize ACL-8111*/
_8111_Switch_Card_No( CARD_1 );
_8111_Switch_Card_No( CARD_2 );
*/
*/
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• C/C++ Library for DOS
5.4 _8111_DI
@ Description
This function is used to read data from digital input port. There are
16-bit digital inputs on the ACL-8111. The bit 0 to bit 7 are defined as low byte and the bit 8 to bit 15 are defined as the high byte.
@ Syntax int _8111_DI( int port_number, unsigned char *data )
@ Argument: or DI_HI_BYTE.
DI_LO_BYTE: bit 0 ~ bit 7,
DI_HI_BYTE: bit8 ~ bit15 data:
@ Return Code: return value from digital port.
ERR_NoError
ERR_BoardNoInit
ERR_PortError
@ Example:
See Demo program . Demo Program 'DI_DEMO.C'
C/C++ Library for DOS
• 37
5.5 _8111_DI _Channel
@ Description
This function is used to read data from digital input channels (bit).
There are 16 digital input channels on the ACL-8111. When performs this function, the digital input port is read and the value of the corresponding channel is returned.
Note: channel means each bit of digital input ports.
@ Syntax int _8111_DI_Channel(int di_ch_no, unsigned int *data )
@ Argument: data: return value, either 0 or 1.
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_InvalidDIChannel
@ Example:
#include “8111.h” main()
{
int ch;
.
.
.
_8111_Initial( CARD_1, 0x220 );
/* Assume NoError when Initialize ACL-8111 */
for( ch=0; ch<16; ch++ )
{
_8111_DI_Channel( ch , &data );
printf( "The value of DI channel %d is %d.\n" , ch , data );
}
}
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• C/C++ Library for DOS
5.6 _8111_DO
@ Description
This function is used to write data to digital output ports. There are
16 digital outputs on the ACL-8111, they are divided by two ports,
DO_LO_BYTE and DO_HI_BYTE. The channel 0 to channel 7 are defined in DO_LO_BYTE port and the channel 8 to channel 15 are defined as the DO_HI_BYTE port.
@ Syntax int _8111_DO(int port_number, unsigned char data )
@ Argument: data: value will be written to digital output port
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_PortError
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
_8111_Initial( CARD_1, 0x220 );
/* Assume NoError when Initialize ACL-8111 card */
.
.
_8111_DO( DO_LO_BYTE , 0x55 ); printf( "The low byte is now 0x55.\n" );
_8111_DO( DO_HI_BYTE , 0xAA ); printf( "The high byte is now 0xAA.\n" );
}
A more detailed program is Provided in this software 'DO_DEMO.C'
C/C++ Library for DOS
• 39
5.7 _8111_DA
@ Description
This function is used to write data to D/A converters. There is a
Digital-to-Analog conversion channel on the ACL-8111. The resolution is 12-bit, i.e. the range is from 0 to 4095.
@ Syntax int _8111_DA(unsigned int data )
@ Argument: data: D/A converted value, if the value is greater than
4095, the higher 4-bits are negligent.
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_InvalidDAChannel
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
_8111_Initial( CARD_1, 0x220 );
/* Assume NoError when Initialize ACL-
8111 */
/* if the hardware setting for DA output range is
0~5V */
_8111_DA( 0x800 );
printf( "The output voltage is 2.5V
\n" );
}
A more complete program is provided in this software. 'DA_DEMO.C'
40
• C/C++ Library for DOS
5.8 _8111_AD_Set_Channel
@ Description
This function is used to set AD channel by means of writing data to the multiplexer scan channel register. There are 8 single-ended A/D channels in ACL-8111, so the channel number should be set between 0 to 7 only. The initial state is channel 0 which is a default setting by the ACL-8111 hardware configuration.
@ Syntax int _8111_AD_Set_Channel( int ad_ch_no )
@ Argument:
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_InvalidADChannel
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
_8111_Initial( CARD_1, 0x220 );
/* Assume NoError when Initialize ACL-8111 */
...
_8111_AD_Set_Channel( 3 ); printf( "AD channel 3 is now selected.\n" );
/* the following A/D's operation is based on channel 3
*/
}
C/C++ Library for DOS
• 41
5.9 _8111_AD_Set_Gain
@ Description
This function is used to set the A/D analog input range by means of writing data to the A/D range control register. The initial value of gain is “1’ which is set by the ACL-8111 harware. The relationship between gain and input voltage ranges is specified by following tables:
The initial value of gain is '1‘ and input type is bipolar, which are preset by the ACL-8111 hardware. The relationship between analog input voltage range, gain and input mode are specified by following tables:
Input Range (V)
±
5 V
±
2.5 V
±
1.25 V
±
0.625 V
±
0.3125V
Gain
X 1
X 2
X 4
X 8
X 16
Gain Code
AD_GAIN_1
AD_GAIN_2
AD_GAIN_4
AD_GAIN_8
AD_GAIN_16
@ Syntax int _8111_AD_Set_Gain( int ad_range )
@ Argument: ad_range: the programmable range of A/D conversion, to above tabbs for the possible
@ Return Code: values .
ERR_NoError
ERR_BoardNoInit
ERR_AD_InvalidRange
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
_8111_Initial( CARD_1, 0x220 );
/* Assume NoError when Initialize ACL-8111
*/
42
• C/C++ Library for DOS
_8111_AD_Set_Gain( AD_GAIN_8 ); printf( "The A/D analog input range is +/-
0.625V now.\n" );
}
5.10 _8111_AD_Set_Mode
@ Description
This function is used to set the A/D trigger and data transfer mode by means of writing data to the mode control register. The hardware initial state of the ACL-8111 is set as AD_MODE_1 software( internal) trigger with program polling data.
A/D Mode Description
AD_MODE_0
AD_MODE_1
AD_MODE_2
AD_MODE_3
AD_MODE_4
AD_MODE_5
Software Trigger, Software Polling Transfer
Software Trigger, Interrupt Transfer
External Trigger, Software Polling Transfer
External Trigger, Interrupt Transfer
Timer Trigger, Software Polling Transfer
Timer Trigger, Interrupt Transfer
@ Syntax int _8111_AD_Set_Mode(int irq_no, int ad_mode )
@ Argument: irq_no: interrupt IRQ level ad_mode: AD trigger and data transfer mode
( please to refer above table.)
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_InvalidMode
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
C/C++ Library for DOS
• 43
}
_8111_Initial( CARD_1 , 0x220 );
/* Assume NoError when Initialize ACL-8111 */
_8111_AD_Set_Mode( IRQ5, AD_MODE_0 ); printf( "Now, disable internal trigger.\n" );
44
• C/C++ Library for DOS
5.11 _8111_AD_Soft_Trig
@ Description
This function is used to trigger the A/D conversion by software. When the function is called, a trigger pulse will be generated and the converted data will be stored in the base address Base +4 and Base
+5, and can be retrieved by function _8111_AD_Aquire(). Please refer to section 6.11.
@ Syntax int _8111_AD_Soft_Trig( void )
@ Argument:
None
@ Return Code:
ERR_NoError
ERR_BoardNoInit
@ Example:
Please refer the example in next section.
5.12 _8111_AD_Aquire
@ Description
This function is used to poll the AD conversion data. It will trigger the
AD conversion, and read the 12-bit A/D data until the data is ready
('data ready' bit becomes low).
@ Syntax int _8111_AD_Aquire( int *ad_data )
@ Argument:
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_AD_AquireTimeOut
@ Example:
#include “aclerr.h”
#include “8111.h” main()
{
_8111_Initial( CARD_1, 0x220 );
C/C++ Library for DOS
• 45
/* Assume NoError when Initialize ACL-8111 */
/* Set to software trigger at first*/
_8111_AD_Set_Mode( IRQ5, AD_MODE_1 );
/* then trigger the AD */
_8111_AD_Soft_Trig();
/* wait for AD data ready then read it */
ErrCode = _8111_AD_Aquire( &ad_data ); if( ErrCode == ERR_NoError ) printf( "The AD value is %d.\n", ad_data ); else printf( "AD conversion error happen\n" );
}
Also see deme program 'AD_DEMO1.C'
5.13 _8111_CLR_IRQ
@ Description
This function is used to clear interrupt request which requested by the ACL-8111. If you use interrupt to transfer A/D converted data, you should use this function to clear interrupt request status, otherwise no new coming interrupt will be generated.
@ Syntax int _8111_CLR_IRQ( void )
@ Argument
None
@ Return Code:
ERR_NoError
ERR_BoardNoInit
5.14 _8111_AD_INT_Start
@ Description
The function will perform A/D conversion N times with interrupt data transfer by using pacer trigger. It takes place in the background which will not be stopped until the Nth conversion has been completed or your program execute _8111_AD_INT_Stop() function to stop the process. After executing this function, it is necessary to
46
• C/C++ Library for DOS
check the status of the operation by using the function
8111_AD_INT_Status(). The function is perform on single A/D channel with fixed analog input range.
C/C++ Library for DOS
• 47
@ Syntax int _8111_INT_Start( int ad_ch_no, int ad_range, int irq_ch_no, int count, int *ad_buffer,
@ Argument: section 6.9 for the possible values. irq_ch_no: IRQ channel number used to transfer AD data, the possible value is defined in ' 8111.h ' count: the numbers of A/D conversion store the A/D data, the buffer size must be c1: the 16-bit timer frequency divider of timer channel #1 c2: the 16-bit timer frequency divider of timer channel #2
@ Return Code:
ERR_NoError
ERR_InvalidTimerValue
ERR_BoardNoInit
ERR_InvalidADChannel
ERR_AD_InvalidRange
ERR_InvalidIRQChannel
@ Example:
See demo Program 'AD_Demo2.C'
48
• C/C++ Library for DOS
5.15 _8111_AD_INT_Status
@ Description
Since the _8111_AD_INT_Start() function executes in background, you can issue the function _8111_AD_INT_Status to check the status of interrupt operation.
@ Syntax int _8111_AD_INT_Status( int *status , int *count )
@ Argument: status: status of the INT data transfer
0: A/D INT is completed
1: A/D INT is not completed count: current conversion count number.
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_AD_INTNotSet
@ Example:
See demo program 'AD_Demo2.C'
5.16 _8111_AD_INT_Stop
@ Description
This function is used to stop the interrupt data trans fer function. After executing this function, the internal AD trigger is disable and the AD timer is stopped. The function returns the number of the data which has been transferred, no matter whether the AD interrupt data transfer is stopped by this function or by the _8111_AD_INT_Start() itself.
@ Syntax int _8111_AD_INT_Stop( int *count )
@ Argument: count: the number of A/D data which has been transferred.
@ Return Code:
ERR_NoError
ERR_BoardNoInit
ERR_AD_INTNotSet
@ Example:
See Demo Program 'AD_Demo2.C'
C/C++ Library for DOS
• 49
5.17 _8111_AD_Timer
@ Description
This function is used to setup the Timer #1 and Timer #2. Timer #1
& #2 are used as frequency divider for generating constant A/D sampling rate dedicatedly. It is possible to stop the pacer trigger by setting any one of the dividers as 0. The AD conversion rate is limited due to the conversion time of the AD converter, the highest sampling rate of the ACL-8111 can not be exceeded 30 KHz,Thus the multiplication of the dividers must be larger than 70.
@ Syntax int _8111_AD_Timer( unsigned int c1 , unsigned int c2 )
@ Argument: c1: frequency divider of timer #1 c2:
@ Return Code: frequency divider of timer #2,
ERR_NoError
@ Example: main()
{
_8111_Initial( CARD_1, 0x220 );
/* Assume ERR_NoError when Initialize ACL-
8111 */
_8111_AD_Timer( 100 , 100 );
/* set AD sampling rate to 2MHz/(10*10) */
..
}
_8111_AD_Timer( 0 , 0 );
/* stop the pacer trigger */
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• C/C++ Library for DOS
6
Calibration
In data acquisiti on process, how to calibrate your measurement devices to maintain its accuracy is very important. Users can calibrate the analog input and analog output channels under the users' operating environment for optimizing the accuracy. This chapter will guide yo u to calibrate your ACL-8111 to an accuracy condition.
Note: Your ACL-8111 board has been carefully calibrated in the factory before it is shipped to you.
6.1 What do you need
Before calibrating your ACL-8111 card, you should prepare some equipment for the calibration:
1. Calibration program: once the program is executed, it will guide you to do the calibration. This program is included in the delivered package.
2. One 5 1/2 digit multi -meter (6 1/2 digital multi -meter is recommended)
3. A voltage calibrator or very stable and noise free DC voltage generator.
Calibration
• 51
52
• Calibration
6.2 VR Assignments
There are five variable resistors (VR) on the ACL-8111 board to allow you making accurate adjustment on A/D and D/A channels. The function of each VR is specified below:
VR No.
VR1
Function
D/A full scale adjustment
VR2
VR3
VR4
VR5
D/A zero offset adjustment
A/D offset adjustment
A/D full scale adjustment
A/D programmable amplifier offset adjustment
6.3 D/A Calibration
The D/A input reference voltage should be connected to for calibration. You may use the JP1 to select the -5V or -10V reference.
The zero offset and full scale of D/A channel can be turned through
VR1 and VR2. The full-scale gain of D/A is adjusted by VR1, and zero offsets are adjusted by VR2.
Note: A precision voltmeter to measure the D/A output is very important.
The procedures of calibration are as follows:
•
Full scale adjustment:
1. Set JP1 to select -5V as reference voltage.
2. Connect VDM (+) to CN1 pin 30 and VDM (-) to A.GND.
3. Write digital data '4095' (0x0FFF) into D/A's digital data
Register (BASE+4 and BASE+ 5).
4. Adjust VR1 until your voltmeter's voltage reading is equal to
+5V (reference voltage with opposite sign).
•
Offset zero adjustment:
1. Write digital data ' 0' (0x0000) to D/A's digital data register
(BASE+4 and BASE+ 5).
2. Adjust VR2 until the your voltmeter's voltage reading is 0V.
Calibration
• 53
6.4 A/D Calibration
Since the ACL-8111 provides versatile A/D input ranges, the calibration on one A/D range may cause a small offset on other ranges. It is suggested that you calibrate the A/D range which you need best accuracy.
The procedures of calibration are as follows:
1. Set the analog input range as: +/- 5V, i.e. the gain = 1
2. Short the A/D channel 0 (pin 1 of CN1) to ground (GND), and connect the TP1 (+) and TP2 (-) with your DVM. Trim the variable resister VR5 to obtain 0 reading in the DVM.
3. Applied a +5V input signal to A/D channel 0, and trim the VR4 to obtain reading between 4094~4095.
4. Applied a +0V input signal to A/D channel 0, and trim the VR3 to obtain reading flickers between 2048~2049.
5. Repeat step 2 and step 3, adjust VR3 and VR4.
54
• Calibration
Appendix A. Demo.
Programs
In this software diskette, there are 6 demonstration programs are provided. They could help you to program your application by using C
Language Library easily. The description of these programs are specified as follows:
AD_DEMO1.C: A/D conversion uses software trigger and program data transfer.
AD_DEMO2.C A/D conversion uses interrupt and program data transfer.
AD_DEMO3.C:
DA_DEMO.C:
DI_DEMO.C:
DO_DEMO.C:
A/D conversion uses DMA data transfer.
D/A conversion
Read data from digital input channels
Write data to digital output channels
Appendix A • 55
Product Warranty/Service
Seller warrants that equipment furnished will be free form defects in material and workmanship for a period of one year from the confirmed date of purchase of the original buyer and that upon written notice of any such defect, Seller will, at its option, repair or replace the defective item under the terms of this warranty, subject to the provisions and specific exclusions listed herein.
This warranty shall not apply to equipment th at has been previously repaired or altered outside our plant in any way as to, in the judgment of the manufacturer, affect its reliability. Nor will it apply if the equipment has been used in a manner exceeding its specifications or if the serial number has been removed.
Seller does not assume any liability for consequential damages as a result from our product uses, and in any event our liability shall not exceed the original selling price of the equipment.
The equipment warranty shall constitute the sole and exclusive remedy of any Buyer of Seller equipment and the sole and exclusive liability of the Seller, its successors or assigns, in connection with equipment purchased and in lieu of all other warranties expressed implied or statutory, including, but not limited to, any implied warranty of merchant ability or fitness and all other obligations or liabilities of seller, its successors or assigns.
The equipment must be returned postage-prepaid. Package it securely and insure it. You will be charged for parts and labor if you lack proof of ate of purchase, or if the warranty period is expired.
Product Warranty/Service • 57
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