Table of Contents
Advertisement
Serial Interface
(continued)
Serial Interface Signal Definition
PIN
SIGNAL
DIRECTION
1
AA
2
BA
l1X)
From Printer
3
BB
(RX)
To Printer
4
CA
(RTS)
From Printer
5
CB
(CTS)
To Printer
6
CC
(DSR)
To Printer
7
ov
Nov 93
DESCRIPTION
Chassis Ground
Printer transmits coded BUSY /READY status
as DC1/DC3 (XON/OFF) or as a 200msec.
BREAK.
This is the primary input line that carries the
data from the source to the printer. Data is
accepted while online and for 1 second after
going offline to allow for line delays during
satellite communications.
Request To Send - Normally high. Can be
used to reflect BUSY /READY (AS), FAULT
(Al6), and SELECT (A24) status. A32 is used
to reverse the level.
Clear To Send - Used to indicate to the print-
er that transmission to the host is not inhib-
ited. Printer can transmit if using CD 1 / DC3
or BREAK protocol.
CB must be positive or open (not tied to CA or
CD) for DC!/DC3 protocol.
Data Set Ready - Printer transmitting is in-
hibited unless signal is high. See strap B4 in
Appendix F. Printer can still receive data.
Printer Signal Ground
Chap<cr 4. Prin1<r ln1erface
4-11
Advertisement
Table of Contents
