Interfaces - Citizen CLP-621 User Manual

Appendixes

Interfaces

This printer is connected to a computer and prints according to commands
sent from the computer.
There are three types of computer interfaces, and these are connected to
devices suited to each type of interface. The printer can also be connected
to a computer by the optional Ethernet.
Serial Interface
Specifications
System Start/stop asynchronous duplex communication
Signal level RS-232C
Baud rate 2400, 4800, 9600, 19200, 38400,57600, 1 15200bps
Bit length 7Bit, 8Bit
Stop bit 1Bit, 2Bit
Parity Odd, even, none
Connector D-SUB 25PIN
Signal line and pin arrangement
Pin No. Signal code Signal name
1 FG Protective
grounding
2 TXD Transmitted data Signal line that transmits data from the
3 RXD Received data
4 RTS Transmission
request
5 NC ------
6 DSR Data set relay
7 SGND Signal line
ground
8-13 NC ------
14 VCC +5V
15-19 NC ------
20 DTR Data terminal
relay
21-25 NC ------
52
Function
Protective grounding
printer to other devices
Signal line that transmits data from other
devices to the printer
Pull up to +12V through 3.3kΩ
Not used
Signal line that is active when an external
device can interface with the printer
Shows the ground level of the signal line
Not used
(FACTRY USE ONLY )
Not used
Signal line that is active when an external
device can interface with the printer
Not used