Citizen CLP-621, Technical Manual

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2-4. Interface
2-4. Interface
2-49
CLP-621 & CLP-631
2-4-1. Serial Interface
(1) Specifications
System Start/stop asynchronous full duplex communication
Signal level RS-232C
Baud rate 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps
Data length 7 bits, 8 bits
Stop bit 1 bit, 2 bits
Parity Odd, even, none
Connector D-SUB JHBY-25S-1A3G 25PIN (JST)
(2) Signal line and pin assignment
Pin No. Signal Abbr. Signal name Function
1 FG Frame ground Protective grounding
2 TXD Transmit Data Signal line that transmits data from the printer to
the host
3 RXD Receive data Signal line that transmits data from the host to
the printer
4 RTS Request To
Send
Pulled up to +12V through 3.3 k Ω
5 NC ------ Not used
6 DSR Data Set Ready Signal line that is active when the host can
interface with the printer
7 SGND Signal ground Signal grounding line
8-17, 19 NC ------ Not used
14 VCC +5V (Factory use only )
20 DTR Data Terminal
Ready
Signal line that is active when the printer can
interface with the host
21-25 NC ------ Not used