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A 1 Serial Interface RS-232C / RS-422
A 1.1 Interface Characteristics
PG
Protective Ground
TXD
Transmit Data (from printer to host)
RXD Receive Data (from host to printer)
Request to Send (printer is requesting data transfer from
RTS
host)
CTS
Clear to Send (host is ready to receive data from printer)
Data Set Ready (host is requesting data transfer from
DSR
printer,can not be used for flow control, internaly set to "1")
SG
Signal Ground
Data Terminal Ready (printer is ready to receive - see
DTR
also on the following pages the data communication
protocols for detail meaning
PG
Protective Ground
RDA
Receive Data (from host to printer)
SDA
Send Data (from printer to host)
SDB
Not Send Data (from printer to host)
RDB
Not Receive Data (from host to printer)
Transmission rate:
Parity:
Number of stop bits: In receive mode the printer accepts 1, or 2 stop bits. The printer transmits
Transmission Protocols:
• DTR - Ready/Busy (only RS-232C)
• XON/XOFF
• XON/XOFF + DTR (only RS-232C)
Signal Description RS-232C
Signal Description RS-422
600, 1200, 2400, 4800, 9600, or 19200 baud
even, odd, or none, Word length: 7, or 8 bits
always two bits.
Pin
No.
Direction
1
2
OUTPUT
3
INPUT
4
OUTPUT
5
INPUT
6
INPUT
7
20
OUTPUT
Pin No.
Direction
1
3
INPUT
9
OUTPUT
10
OUTPUT
18
INPUT
Appendix A-2
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