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