KSC Instructions
M-S Cash Drawer Corporation
KSC type interface instructions
Introduction
M-S Cash Drawer interface type KSC enables the cash drawer to be controlled by a
computer's serial port and incorporates the following unique features:
• No external power source or AC adaptor is required for standard RS-232 serial
interfaces.
• Selectable noise filtering circuitry to prevent false openings.
• Standard "Drawer Open" signal which can be used to indicate the drawer's
status.
Options
•
•
•
•
Integration, Test and Troubleshooting software for IBM compatible MS-DOS
systems is available for all M-S Cash Drawer interfaces. The software may be
ordered for $5 plus shipping.
KSC equipped cash drawers require an interface cable between the cash drawer
and the host computer. Three versions of this interface cable are available from
M-S Cash Drawer: DB25 female, DB9 female, and Unterminated.
The KSC is powered directly from the computer's serial interface card for most
installations. Some POS software turns off the serial interface power between
drawer openings.
Optional driver software to monitor and power the serial interface can be
ordered from M-S Cash Drawer for $5 plus shipping for these installations. An
optional AC adapter can be ordered for $10 plus shipping.
Installation - Serial Interface
This installation uses a dedicated RS-232 serial port on your computer or terminal to
send an "open" command to the trigger board in the cash drawer. Any data sent on this
port will open the cash drawer. (If it is necessary to independently operate a printer or
other device on the same serial port, the KSI interface type is required).
Step by Step
1. Connect the interface cable between the cash drawer and the computer's serial port.
KSC Cabling Specifications
Mini Din
Computer Serial Port
Connector
Pin #
25 Pin
9 Pin
Brown
Shell
1
5
Green
6
2
3
Blue
1
3
2
Red
2
4
7
Black
7
7
5
White
8
22
9
Jumper 1*
4-5
7-8
Jumper 2*
6-8-20
1-4-6
* Jumpers simulate hardware handshaking
Color
Definition
FG
TxD
RxD
RTS
SG
RI
RTS-CTS
DSR-DCD-DTR
2. Set DIP switches. There are four configuration switches visible on the back of the
cash drawer The ON direction is noted on the switch by an arrow.
Use either:
Use either:
DIP Switch Settings
SW1
SW2
Definition
ON
OFF
Selects TxD as open pulse source
OFF
ON
Selects RxD as open pulse source
SW1 & SW2 must be
* = Factory default
opposite one another
SW3
SW4
OFF
ON
ON
OFF
SW3 & SW4 must be
opposite one another
Definition
Noise filter active
Noise filter inactive
*
*
* = Factory default
3. Factory settings are correct for most installations. If you are using a terminal which
sends serial data on pin 3 of a DB25 connector or pin 2 of a DB9 connector, then set
SW2 ON and SW1 OFF. If you are using a slow baud rate (below 1200) the high
noise filter may reject opening characters as noise. Try setting SW3 ON and SW4
OFF to eliminate noise rejection or use a higher baud rate (1200 to 9600).
4. Make sure center drawer lock is unlocked. (The manual release on the right of the
drawer is always unlocked). Plug in the AC adapter to jack on rear of drawer if your
system requires one. Check everything over one more time.
5. Send serial characters to open the drawer.
6. Use the test software to set up and test the drawer (See OPTIONS above).
7. The drawer may also be tested from DOS on an IBM compatible computer by typing
in the following lines - press ENTER at the end of each line:
C:> MODE COM1:1200,n,8,1
C:> ECHO > COM1: @
C:> ECHO > COM1: @@@@@
•
•
•
•
•
The first line sets up the serial port. (Replace COM1: with your correct port ID.)
The second line turns on the port.
Wait 5 seconds for KSC to initialize.
Then type line 3 to send characters and open drawer
Repeat line 3 to open drawer again.
Using the “Drawer Open Signal”
The drawer open signal (the White wire of the interface cable) can be read by software
as Ring Indicate (pin 22 on a DB25 connector). The signal is 12VDC (High) when the
drawer is open and Ground (Low) when the drawer is closed. The following example
shows how this signal can be read from "BASIC" using an IBM PC or compatible
computer:
50 A% = INP(&H3FE):IF(A% AND 64) > 0 then PRINT "Drawer is open" for COM1: or
50 A% = INP(&H2FE):IF(A% AND 64) > 0 then PRINT "Drawer is open" for COM2:
Troubleshooting
If you are having trouble, use the test software to troubleshoot. This software uses the
computer to read and diagnose most problems.
Some common things to check are:
• Carefully re-check the Switches, Drawer Lock and interface cable. Check
continuity and jumpers if possible.
• Make sure you are plugged into the serial port, not the parallel port of the
computer
• Try sending more characters in your opening command - 5 or more.
• Try setting no filter switch setting - SW3 ON and SW4 OFF.
• Try setting terminal mode switch setting - SW2 ON and SW1 OFF Reset to
standard settings if drawer does not open.
• Try using the driver software or an AC adapter (see OPTIONS above). The
adapter must be a special negative tip adapter available from M-S Cash Drawer.
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