Operator's Guide B-7

SERIAL INTERFACE PIN-OUTS FOR PRINTER

The printer is a DTE device. The table that follows summarizes the pin

assignments on the printer end of a serial interface.

Pin # Signal Name Abbr. Comment
1 Frame Ground FG
2%Transmitted Data TxD
3&Received Data RxD
4%Request To Send RTS Always high; + 12v, signal level.
5&Clear To Send CTS <optional, not implemented>
6&Data Set Ready DSR <optional, not implemented>
7 Signal Ground SG
8
9%RS-422-A TxD- Tx D 422- <optional, not implemented>
10 %RS-422-A TxD+ TxD 422+ <optional, not implemented>
11 %Auxiliary DTR*—— Same as Pin 20.
12
13
14
15
16
17
18 &RS-422-A RxD+** RxD 422+ <optional, not implemented>
19 %Auxiliary DTR*—— Same as Pin 20.
20 %Data Terminal Ready DTR High until buffer fills, then low.
21
22
23
24
25

* Technically, not an RS-232-C signal. See ”DTR Polarity” under Serial Options in the configuration menu. See
“Handshaking” later in this appendix for more information.
** RxD on Pin 3 is used as the differential complement RxD 422- of this signal line.