M-S Cash Drawer EP-125KC Instructions

M-S Cash Drawer Corporation 

KC type interface instructions

Introduction 

The KC trigger board and external power supply (AC adapter) enable the cash drawer 

to be controlled by a serial output port.  

Interfacing 

The trigger board requires a pulse >3.5 VDC for at least 100 milliseconds to reliably 

open the drawer. The preferred and most common way to supply this signal is via a 

standard serial port on your host operating at 300 BAUD or slower. The higher the baud 

rate the longer the string of characters needed to produce the required pulse.  

Installation – Dedicated Serial Interface 

This method 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 which is a minimum 100 milliseconds 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. Please refer to the KSI instructions for more information.  

Cabling Specifications 

Computer Serial Port 

Data Terminal 

Color 

25 pin 

9 pin 

25 pin 

Definition 

White 

2 

3 

3 

TxD 

Black 

7 

5 

7 

SG 

Jumper 1* 

4-5 

7-8 

4-5 

RTS-CTS 

Jumper 2* 

6-8-20 

1-4-6 

6-8-20 

DSR-DCD-DTR 

* Jumpers simulate serial port handshaking 

Integration 

Connect the cash drawer interface cable to the computer's serial port. Plug the AC 

adapter cable into the mating connector on the back of the cash drawer. Plug the AC 

adapter into the 115 VAC wall socket. Check to make sure the drawer is unlocked and 

operates manually with the keylock. Close the drawer. The drawer should now open 

whenever data is sent to the serial port.  

Testing 

Testing the drawer involves configuring the serial port and sending data to the cash 

drawer. The following test are for IBM PC's and compatibles. The software used with 

the cash drawer should perform similar functions.