AMX AXC-232 RS-232422485 INTERFACE CARD Instruction manual

instruction manual
AXC-232++
RS-232/422/485 Interface Card
Axcess Control Cards
Table of Contents
Table of Contents
Introduction ...............................................................................................................1
Specifications .................................................................................................................... 1
Installation and Wiring .............................................................................................3
Setting the Internal Jumpers ............................................................................................. 3
Setting jumper JP1 to terminate RS-422 input with 100 ohms................................................. 3
Setting jumper JP2 to set the RS-422 port for RS-485 use ..................................................... 3
Setting the RS-232/422 DIP Switch .................................................................................. 4
Wiring Devices to the AXC-232++..................................................................................... 5
Card Edge Pinouts ................................................................................................................... 5
Preparing captive wires............................................................................................................ 5
Using RS-232........................................................................................................................... 5
Using RS-422........................................................................................................................... 6
Using RS-485........................................................................................................................... 6
Using Hardware Handshaking ................................................................................................. 6
Installing the AXC-232++ in a CardFrame: .............................................................................. 6
Replacing the Lithium Batteries ............................................................................................... 7
Programming ............................................................................................................9
Send_Commands.............................................................................................................. 9
Axcess program characteristics ............................................................................................. 11
Send_String Escape Sequences..................................................................................... 12
AXC-232++ statements.......................................................................................................... 13
Xmodem Timing Commands........................................................................................... 14
AXlink Master Statements ............................................................................................... 14
Reserved Channels......................................................................................................... 15
Axcess Master Mode....................................................................................................... 15
AXC-232++ RS-232/422/485 Interface Card
i
Table of Contents
ii
AXC-232++ RS-232/422/485 Interface Card
Introduction
Introduction
Many audiovisual and computer-based devices can be remotely controlled using RS-232, RS-422,
or RS-485 commands. The AXC-232++ RS-232/422/485 Interface Card can generate virtually
unlimited numbers of product/function commands as they are programmed into the AXC-EM
Master Card. As needs and technology change, existing cards can be reprogrammed or new cards
added, one for each device.
One AXC-232++ card (FIG. 1) is required for each RS-232/422/485 controlled piece of equipment.
The AXC-232++ card has a DIP switch to set communications parameters (data bits, stop bits,
parity, and baud rates from 300 to 115,200 bps).
Card edge pinouts
Internal jumper J1
Lithium batteries
8-position RS-232/422
DIP switch
Internal jumper J2
LED indicator for data
transmission (TX)
LED indicator for data
reception (RX)
FIG. 1 AXC-232++
Onboard processing and memory allows the controller to take on complex tasks by itself, reducing
the processing burden for the AXlink master program. For example, the master program can use
simplified commands for generic video switcher or codec control, while a modular driver program
in the AXC-232++ handles control for specific makes and models.
Specifications
The table below lists the AXC-232++ specifications.
Specifications
Dimensions
2.7" (69.3 mm) height
12.8" (325.6 mm) depth
Power requirement
12 VDC
Power consumption
160 mA
Weight
4.8 oz (136.1 g)
Mounting
Inserts into an Axcess CardFrame
AXC-232++ RS-232/422/485 Interface Card
1
Introduction
Specifications (Cont.)
LEDs:
RX/TX:
Red LED indicators for data transmission
RX:
Red LED blinks to indicate that the AXC-232++ is receiving RS-232,
RS-422, or RS-485 data.
TX:
Red LED blinks to indicate that the AXC-232++ is sending RS-232,
422, or RS-485 data.
DIP Switch
RS-
8-position RS-232/422DIP switch.
See Setting the RS-232/422 DIP Switch section on page 4 for configuration
details.
Asynchronous data
standards
• Baud rates - 300, 600, 1200. 2400, 4800, 9600, 19200 and 38400.
57600 is supported via the BAUDMED Send Command (see
Send_Commands section on page 9 for details).
115200 is supported via the BAUDHIGH Send Command (see the
Send_Commands section on page 9 for details).
• Data bits - 7, 8, and 9
• Stop bits - 1 and 2
• Parity - None, Odd, Even, Mark and Space
Connectors:
• RS-232
Hardware handshaking (RTS/CTS) data control jack (3-pin male)
• RS-422
RS-232/422 data control jack (4-pin male)
• +12VDC
Auxiliary power jack (1-pin male)
• RS-232
RS-232 data control jack (3-pin male)
• AXlink
AXlink bus jack (4-pin male)
Buffer
• 1000 byte input buffer
• 1000 byte AXlink buffer
Internal jumpers
2
Sets differential input termination to enable RS-485 output.
Processor
32-bit processor
Memory
384K of non-volatile memory (memory runs Axcess programs independent of
the master program. This relieves the AXlink bus and the master of the processing time for controlling those devices; requires Axcess version 3.0 or
higher).
AXC-232++ RS-232/422/485 Interface Card
Installation and Wiring
Installation and Wiring
Setting the Internal Jumpers
The AXC-232++ can be used as an independent RS-232/422/485-controlled interface by setting the
internal jumpers (JP1 and JP2). FIG. 1 indicates the location of the jumpers on the card.
Static electricity can damage electronic components. Before opening the device,
discharge any accumulated static electricity from your body by touching a grounded
metal object.
Setting jumper JP1 to terminate RS-422 input with 100 ohms
Terminating a device involves installing a 100 ohm line terminator. This is typically used to achieve
better communication and signal integrity. You will want to terminate when the communication is
at a high data rate or over a long distance. Termination can be harmful because it increases the
current in the line, and causes more radiation that could interfere with signals.
Jumper JP1 places 100 Ohms termination across RS422 receive data pins 5 & 6:
1. Disconnect the RS-232/422/485 connectors.
2. Slide the card out of the cardframe.
3. Locate the JP1 jumper (see FIG. 1 on page 1).
4. Install the jumper in the 'ON' position (default setting = OFF).
5. Slide the card back into the cardframe.
6. Reconnect the RS-232/422/485 connectors.
Setting jumper JP2 to set the RS-422 port for RS-485 use
1. Disconnect the RS-232/422/485 connectors.
2. Slide the card out of the cardframe.
3. Locate the JP2 jumper (see FIG. 1 on page 1).
4. Set jumper JP2 to the ON position (default setting is OFF).
5. Slide the card back into the cardframe.
6. Reconnect the RS-232/422/485 connectors.
AXC-232++ RS-232/422/485 Interface Card
3
Installation and Wiring
Setting the RS-232/422 DIP Switch
Set the stop bits, data bits, parity, and baud rate on the RS-232/422 DIP switch (see FIG. 1). The
AXC-232++ supports the following asynchronous data standards:
Stop bits 1 and 2
Data bits 7, 8, and 9
Parity None, Odd, Even, Mark, and Space
Baud rates 300, 600, 1,200, 2,400, 4,800, 9,600, 19,200 and 38,400.
57,600 is achieved by setting the DIP switch to 300 baud, and using the
’BAUDMED’ Send_Command (see the Send_Commands section on page 9 for
details).
115,200 is achieved by setting the DIP switch to 300 baud, and using the
’BAUDHIGH’ Send_Command (see the Send_Commands section on page 9 for
details).
The table below shows the DIP switch numbers, functions, and their corresponding values.
RS-232/422 DIP Switch Settings
Switch
1
2
3
Function Stop Bits Data Bits
Setting
Value
Off
Off
2 bits
7 bits
On
On
1 bit
8 bits
4
5
6
Off
Off
Off
On
Off
Off
Off
On
On
Off
On
On
On
Off
On
On
Parity
Off
Off
Off
On
On
On
1
2
3
4
5
6
7
8 ON
Off
Off
On
On
None
4
Off
On
Off
Off
On
Off
On
9,600
Odd
On
On
4,800
Even
Off
Off
2,400
Mark
On
Off
1,200
Unused
Off
Off
600
Unused
RS232/422
Off
300
Unused
Off
8
Baud Rates
Unused
On
7
On
On
19,200
On
On
38,400
AXC-232++ RS-232/422/485 Interface Card
Installation and Wiring
Wiring Devices to the AXC-232++
Card Edge Pinouts
The table below lists the card edge pinouts and the function of each.
Card Edge Pinouts
1
2
3
4
5
6
7
8
9
Pin
Signal
Function
1
GND
Ground (RS-232)
2
RX
Receive data (RS-232)
3
TX
Transmit data (RS-232)
4
+12V
Power
5
RX -
Receive data (RS-422)
6
RX +
Receive data (RS-422)
7
TX -
Transmit data (RS-422)
8
TX +
Transmit data (RS-422)
9
GND
Ground
10
CTS
Clear-to-send (hardware handshaking)
11
RTS
Ready-to-send (hardware handshaking)
12 - 16
Factory Use
10
11
12
13
14
15
16
GND
RX
RS-232
TX
+12 V
RX
RX+
RS-422
TXTX+
GND
CTS
Hardware Handshaking
RTS
Preparing captive wires
To secure wires in a captive-wire connector:
1. Strip 1/4 inch off the wire insulation for all four wires.
2. Tin 2/3 of the exposed wire.
3. Insert each wire into the appropriate captive-wire connector, according to figures 9 through 12.
Insert the wire up to the insulation.
4. Turn the captive screws clockwise to secure the fit in the connector.
If the device is using a separate power supply, do not connect the power wiring from
the AXC-232++ to that device.
Using RS-232
When communicating via RS-232, connect the wiring as shown in FIG. 2.
AXCAXB232++
232++
GND
RX
TX
GND
RX
Device
TX
+12V
RX RX +
TX TX +
FIG. 2 RS-232 wiring
AXC-232++ RS-232/422/485 Interface Card
5
Installation and Wiring
Using RS-422
When communicating via RS-422, connect the wiring as shown in FIG. 3.
GND
RX
TX
+12V
AXCAXB232++
GND
TXTX+
RX-
RX RX +
TX TX +
Device
RX+
FIG. 3 RS-422 wiring
Using RS-485
When communicating via RS-485, connect the wiring as shown in FIG. 4.
AXCAXB232++
232++
GND
RX
TX
+12V
RX RX +
TX TX +
Device
FIG. 4 RS-485 wiring
To enable RS-485, set jumper J2 to the ON position (refer to Setting the Internal
Jumpers on page 7).
Using Hardware Handshaking
When the controlled device requires hardware handshaking, connect the wiring as shown in FIG. 5.
1
AXC-232++ 2
3
4
CTS
RTS
RTS
CTS
Device
FIG. 5 Hardware handshaking wiring
Installing the AXC-232++ in a CardFrame:
1. Remove all static electricity by grounding yourself.
2. Hold the card by the tab end and slide the card into the frame, into one of the slots. Make sure
the card is correctly positioned in the guide slot.
3. Gently push the card in until it is firmly seated in the card connector slot. You do not have to
disconnect the power to the CardFrame when you install the card. When power is applied to
the card, the LEDs blink to indicate the connection.
6
AXC-232++ RS-232/422/485 Interface Card
Installation and Wiring
Replacing the Lithium Batteries
The AXC-232++’s lithium batteries have a life of approximately 5 years to protect its memory.
When DC power is on, the batteries are not used. When you install the AXC-232++, record the date
the batteries should be replaced.
There is a danger of explosion if you replace the batteries incorrectly. Replace
batteries with the same or equivalent type recommended by the manufacturer.
Dispose of the used batteries according to the manufacturer’s instructions. Never
recharge, disassemble, or heat batteries above 212°F (100°C). Never solder directly
to the batteries or expose the contents of the batteries to water.
Before you remove the lithium batteries, contact your dealer and verify that they have a current
copy of your program; this avoids any inadvertent loss of data and prevent an unnecessary service
outage.
1. Discharge the static electricity from your body.
2. Unplug the two-pin power connector and any other connectors.
3. Slide the card out of the cardframe.
4. Carefully slide each battery out of its socket (FIG. 6), and insert the new battery.
Battery (CR2032 type - 20mm coin cell)
socket
FIG. 6 Lithium battery and socket
5. Slide the card back into the cardframe.
6. Replace the front panel and refasten the two screws.
7. Reconnect any connectors that you removed.
AXC-232++ RS-232/422/485 Interface Card
7
Installation and Wiring
8
AXC-232++ RS-232/422/485 Interface Card
Programming
Programming
Send_Commands
The AXC-232++ supports the same command set as the AXC-232. Figure 20 lists the AXC-232++
Send_Commands.
AXC-232++ Send_Commands
B9MOFF
Sets data bit mode to normal
with DIP switch settings
(default).
Syntax:
'B9MOFF'
Example:
SEND_COMMAND AXC232,'B9MOFF'
Sets the data bit mode to normal.
B9MON
Enables a special mode to
override DIP switch settings.
Syntax:
'B9MON'
The mode, nine data bits with one stop bit, overrides the data, stop, and parity
settings. When the AXC-232++ issues this command, it locks in the baud rate
determined by the current DIP switch setting.
Example:
SEND_COMMAND AXC232,'B9MON'
Overrides the DIP switch settings.
BAUDHIGH
Enables 115,200 baud rate
when the DIP switch is set to
300 baud.
Syntax:
'BAUDHIGH'
Example:
SEND_COMMAND AXC232,'BAUDHIGH'
Enables 115,200 baud rate.
BAUDLOW
Enables 300 baud rate when
the DIP switch is set to 300
baud setting (default).
Syntax:
'BAUDLOW'
Example:
SEND_COMMAND AXC232,'BAUDLOW'
Enables 300 baud rate.
BAUDMED
Enables 57,600 baud rate
when the DIP switch is set to
300 baud.
Syntax:
'BAUDMED'
Example:
SEND_COMMAND AXC232,'BAUDMED'
Enables 57,600 baud rate.
CB1ON
Syntax:
Enables placement of charac- 'CB1ON'
ters in the buffer specified by
Example:
CREATE_BUFFER 1
SEND_COMMAND AXC232,'CB1ON'
(default).
Enables placement of characters in the buffer.
CB1OFF
Disables placement of characters in the buffer specified
by CREATE_BUFFER 1.
Syntax:
'CB1OFF'
Example:
SEND_COMMAND AXC232,'CB1OFF'
Disables placement of characters in the buffer.
AXC-232++ RS-232/422/485 Interface Card
9
Programming
AXC-232++ Send_Commands (Cont.)
CHARD
Syntax:
Sets delay between all transmitted characters to increment specified.
Variable:
'CHARD-<time>'
time = 100 microsecond increments 0 - 255.
Example:
SEND_COMMAND AXC232,'CHARD-10'
Sets 1mS delay between all transmitted characters.
CTSPSH
Enables PUSHes and
RELEASEs.
Syntax:
'CTSPSH'
Example:
SEND_COMMAND AXC232,'CTSPSH'
Enables PUSHes, RELEASEs, and status on channel 255 ([0,255] within the
AXC-232++) for CTS hardware handshake input. If CTS is high, the channel is
on.
CTSPSHF
Disables the 'CTSPSH'
command.
Syntax:
'CTSPSHF'
Example:
SEND_COMMAND AXC232,'CTSPSHF'
Disables the 'CTSPSH' command.
EOFF
Syntax:
Disables the 'EON '
command (default).
Example:
'EOFF'
SEND_COMMAND AXC232,'EOFF'
Disables the 'EON' command.
EON
Forces the AXC-232++ to
ignore the transmitted characters on its receiver.
Syntax:
'EON'
Example:
SEND_COMMAND AXC232,'EON'
Forces the AXC-232++ to ignore the transmitted characters on its receiver.
When using RS-485, the transmitter and receiver are tied together.
HSOFF
Disables hardware
handshaking (default).
Syntax:
'HSOFF'
Example:
SEND_COMMAND AXC232,'HSOFF'
Enables placement of characters in the buffer.
HSON
Syntax:
Disables placement of characters in the buffer specified
by CREATE_BUFFER 1.
Example:
'HSON'
SEND_COMMAND AXC232,'HSON'
Enables hardware handshaking.
RXCLR
Syntax:
Clears any characters in the
Receive buffer waiting to be
sent to the AXC-EM.
Example:
'RXCLR'
SEND_COMMAND AXC232,'RXCLR'
Clears any characters in the Receive buffer waiting to be sent to the AXC-EM.
If 'RXCLR' is sent while RTS is low, RTS returns high.
10
AXC-232++ RS-232/422/485 Interface Card
Programming
AXC-232++ Send_Commands (Cont.)
RXOFF
Syntax:
AXC-232++ does not pass on
'RXOFF'
received characters to the
Example:
AXC-EM (default).
SEND_COMMAND AXC232,'RXOFF'
AXC-232++ does not pass on received characters to the AXC-EM.
RXON
Syntax:
Enables AXC-232++ to send
'RXON'
incoming characters received
Example:
to the AXC-EM.
SEND_COMMAND AXC232,'RXON'
Enables AXC-232++ to send incoming characters received to the AXC-EM.
The AXC-EM automatically sends this command to the AXC-232++ when it
executes a 'CREATE_BUFFER' program instruction.
TXCLR
Syntax:
Clears and stops any charac'TXCLR'
ters waiting in the Transmit
Example:
buffer.
SEND_COMMAND AXC232,'TXCLR'
Clears and stops any characters waiting in the Transmit buffer.
XOFF
Disables software
handshaking (default).
Syntax:
'XOFF'
Example:
SEND_COMMAND AXC232,'XOFF'
Disables software handshaking.
XON
Syntax:
Enables software
handshaking.
Example:
'XON'
SEND_COMMAND AXC232,'XON'
Enables software handshaking.
ZAP!
Clears the Axcess program in
the AXC-232++.
Syntax:
'ZAP!'
Example:
SEND_COMMAND AXC232,'ZAP!'
Clears the Axcess program in the AXC-232++.
Axcess program characteristics
The AXC-232++ is capable of running Axcess programs. It handles string processing, relieving
AXlink and the AXC-EM of the processing times.
AXC-232++ RS-232/422/485 Interface Card
11
Programming
Send_String Escape Sequences
The AXC-232++ does not regard certain three-character combinations within a Send_String
program as literal characters, but as commands. The following table lists those combinations.
Send_String Escape Sequences
27,17,<time>
Sends a break character of
the specified length of time.
Syntax:
"27,17,<time>"
Variable:
time = 100 microsecond increments 1 - 255.
Example:
SEND_STRING AXC232,"27,17,10"
Sends a break character of 1mS.
27,18,1
Sets the ninth data bit to 1 for
all of the following characters
to be transmitted.
Syntax:
"27,18,1"
Example:
SEND_STRING AXC232,"27,18,1"
Sets the ninth data bit to 1 for all of the following characters to be transmitted.
Used in conjunction with the 'B9MON' command.
27,18,0
Clears the ninth data bit to 0
for all of the next characters
to be transmitted.
Syntax:
"27,18,0"
Example:
SEND_STRING AXC232,"27,18,0"
Clears the ninth data bit to 0 for all of the next characters to be transmitted.
Used in conjunction with the 'B9MON' command.
27,19,<time>
Inserts a delay before the
next character to be
transmitted.
Syntax:
"27,19,<time>"
Variable:
time = 100 microsecond increments 1 - 255.
Example:
SEND_COMMAND AXC232,"27,19,10"
Inserts a 1mS delay before the next character to be transmitted.
27,20,0
Syntax:
Asserts RTS hardware handshake output high.
Example:
"27,20,0"
SEND_COMMAND AXC232,"27,20,0"
Asserts RTS hardware handshake output high.
27,20,1
Asserts RTS hardware handshake output low.
Syntax:
"27,20,1"
Example:
SEND_COMMAND AXC232,"27,20,1"
Asserts RTS hardware handshake output low.
12
AXC-232++ RS-232/422/485 Interface Card
Programming
AXC-232++ statements
The Axcess program of the AXC-232++ communicates with the AXC-EM as Device 0. Its device
communicates with the RS232/422 Input/Output (I/O) of the AXC-232++ as Device 1. The
following table lists AXC-232++ statements.
AXC-232++ Program Statements
Statement
Function
CREATE_BUFFER
0,buffer
Places strings that come from the AXC-EM into buffer. If no
CREATE_BUFFER 0 exists, the incoming strings from the AXC-EM are sent
out the RS232 port.
CREATE_BUFFER
1,buffer
Places strings that come from the RS-232 port into buffer. If no
CREATE_BUFFER 1, exists, the incoming strings are sent to the AXC-EM.
CREATE_BUFFER
2,buffer
Places commands (i.e. SEND_COMMANDs) that come from the AXlink Master
into the buffer. Each command will be preceded by 2 characters: The first character will always be an '*', the second character is the length of the command,
the remaining n characters (as given in the second character) are the
command itself).
CREATE_LEVEL
0,level,variable
Places levels sent by the AXC-EM for level in variable.
OFF[0,channel]
• Sends a RELEASE to the AXC-EM.
• Sends message that channel is off.
OFF[1,channel]
Turns off a channel. This command has no external effect. It can be used as
status.
ON[0,channel]
• Sends a PUSH to the AXC-EM.
• Sends a message that channel is on.
ON[1,channel]
Turns on channel. This command has no external effect. It can be used as status.
SEND_COMMAND
0,command
Sends command to the AXC-EM. Provides support for commands like 'RDS'.
SEND_COMMAND
1,command
Sends command to the AXC-232++ as if the AXC-EM had sent it.
SEND_COMMAND
AXC_232,
'BAUDHIGH'
Sets the baud rate to 115.2k (DIP switch set to 300).
Sets the baud rate to 300 (DIP switch set to 300).
SEND_COMMAND
AXC_232, 'BAUDLOW'
SEND_COMMAND
AXC_232, 'CB1ON'
Enables placement of characters in the buffer specified by
CREATE_BUFFER 1.
SEND_COMMAND
AXC_232, 'CB1OFF'
Disables placement of characters in the buffer specified by
CREATE_BUFFER 1.
SEND_LEVEL
0,level,variable
Sends variable as the value for level..
SEND_STRING
0,string
Sends string to the AXC-EM.
SEND_STRING
1,string
Sends string out the RS-232 port.
AXC-232++ RS-232/422/485 Interface Card
13
Programming
Xmodem Timing Commands
The following table lists the AXC-232++ Xmodem timing commands. Xmodem timeouts exist to
accommodate potential Ethernet delays and for consistency among and within products. Any
Xmodem timing command will change timing and retries for Axcess code download as well as
SOFTROM transfer.
Xmodem Timing Commands
Command
Description
'TIMEOUT XX'
Xmodem timeouts via the Program Port. (Default is 10 sec.)
SEND_COMMAND
SERIAL, 'XMTO XX'
Over AXlink, where XX is from one to 50 seconds in 1-second increments.
'RETRY XX'
Xmodem retries via the Program Port. (Default is 5.)
SEND_COMMAND
SERIAL, 'XMRT XX'
Over AXlink where XX is from one to 10 in increments of one.
AXlink Master Statements
The following table lists the AXlink Master statements for the AXC-232++.
AXlink Master Statements
Statement
Function
MIN_TO
Activates a channel or variable for a minimum amount of time-even if the corresponding device-channel is released. The time duration is determined by
SET_PULSE_TIME.
ON[AXC_232,
channel]
Executes PUSH[0,channel] within AXC-232++.
OFF[AXC_232,
channel]
Executes RELEASE[0,channel] within AXC-232++.
PULSE
Turns on a channel or variable for a certain amount of time. Once the time
elapses, the channel or variable is turned off. The Pulse time remains the same
value until it is changed within the program.
Example:
SET_PULSE_TIME(12)
Sets the current duration of future Pulses to 1.2 seconds.
14
SEND_COMMAND
AXC_232,command
AXC-232++ interprets command.
SEND_LEVEL
AXC_232,level,
variable
Places the variable into the CREATE_LEVEL variable, if it were defined in the
AXC-232++ DEFINE_START section.
SEND_STRING
AXC_232,string
Places the string into the CREATE_BUFFER buffer, if you defined the buffer in
the AXC-232++ DEFINE_START section. If it were not, this command transmits the string out the RS-232 port.
TO
Activates a channel or variable for as long as the corresponding
device-channel of its Push statement is activated. When the device-channel
referenced by the Push statement changes from off to on, the TO starts activating the device-channel or variable in the brackets following it. When the
device-channel of its Push is released, the TO statement stops activating its
device-channel or variable. For this reason, TO must be found only underneath
a Push statement.
AXC-232++ RS-232/422/485 Interface Card
Programming
Reserved Channels
The following table lists the channels reserved on Device 0.
Reserved Channels
Channel
Function
Channel 254
This is only valid within the device and is not sent to the AXlink master. Reflects AXlink
status:
• When AXlink is active, this channel is on.
• When AXlink is inactive, this channel is off.
• When this channel changes state, the AXC-232++ generates a PUSH or RELEASE.
Channel 255
Reflects the state of the CTS input. If the AXC-232++ receives a 'CTSPSH' command,
it generates PUSHes for both the AXC-EM and the AXC-232++.
Axcess Master Mode
When an Axcess device is placed in "Master Mode", the Central Controller’s PROGRAM port is
moved to the Axcess device’s RS-232 port.
Press the escape key, then type either MC or MD:
<esc>MC - connects the device in Master Mode
<esc>MD - disconnects the device
where <esc> means "press the Esc key".
Master Mode can be very useful in situations where physical access to the Central
Controller’s PROGRAM port is not practical (for example, in installations where the
Central Controller is located a long distance from the bus device(s)).
AXC-232++ RS-232/422/485 Interface Card
15
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