Citizen Systems CLP-621 - Manual (Page 52)

Appendixes
52
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 and wireless LAN.
System Start/stop asynchronous duplex communication
Signal level RS-232C
Baud rate 2400, 4800, 9600, 19200, 38400,57600, 115200bps
Bit length 7Bit, 8Bit
Stop bit 1Bit, 2Bit
Parity Odd, even, none
Connector D-SUB 25PIN
Serial Interface
Specifications
Pin No. Signal code Signal name Function
1 FG Protective Protective grounding
grounding
2 TXD Transmitted data Signal line that transmits data from the
printer to other devices
3RXD Received data Signal line that transmits data from other
devices to the printer
4 RTS Transmission Pull up to +12V through 3.3k
Ω
request
5 NC ------ Not used
6 DSR Data set relay Signal line that is active when an external
device can interface with the printer
7 SGND Signal line Shows the ground level of the signal line
ground
8-13NC ------ Not used
14 VCC +5V (FACTRY USE ONLY )
15-19 NC ------ Not used
20 DTR Data terminal Signal line that is active when an external
relay device can interface with the printer
21-25 NC ------ Not used
Signal line and pin arrangement