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Appendix A System Interface Description
1. Serial Interface RS-232C / RS-422
1.1 Interface Characteristics
PG
Protective Ground
TXD
Transmit Data (from printer to host)
RXD
Receive Data (from host to printer)
RTS
Request to Send (printer is requesting data transfer from host)
CTS
Clear to Send (host is ready to receive data from printer)
DSR
Data Set Ready (host is requesting data transfer from printer,
SG
Signal Ground
DTR
Data Terminal Ready (printer is ready to receive - see 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:
$ Word length:
$ Number of stop bits: In receive mode the printer accepts 1, or 2 stop bits.
Transmission Protocols:
$ DTR - Ready/Busy (only RS-232C)
$ XON/XOFF
$ XON/XOFF + DTR (only RS-232C)
A-2
Signal Description RS-232C
can not be used for flow control, internaly set to "1")
Signal Description RS-422
600, 1200, 2400, 4800, 9600, or 19200 baud
even, odd, or none
7, or 8 bits
The printer transmits 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
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