Appendix D
EXTERNAL PORT PIN ASSIGNMENTS
RS-232 PORT
This is a full bidirectional RS-232 port with the capability to respond to a serial input. The port serves
a dual purpose in that if an RS-232 is not desired, the port can be used as a printer output. Software
determines if the port functions as an RS-232 bidirectional port or as an output-only printer port. 25
pin female "D" connector on Processor Module for RS-232 interface at the side panel. Drawing shows
pins as seen from a side view of the Analyzer.
PIN
1 GND
2 TXD (transmit data)
3 RXD (receive data)
4 RTS (request to send)
5 CTS (clear to send)
6 DSR (data set ready)
7 SIG GND (signal ground)
8 DCD* (data carrier detect)
9-19 not used
20 DTR* (data terminal ready)
21 not used
22 RI (Ring Indicator)
23-25 not used
NOTE
For printer use, pins 5 and 20 of this port
should be tied together inside the cable to
the printer. 30-80387B58 printer cable
provides the required interface.
DCD* (Data Carrier Detect) input is not used
in this application.
1
13
14
25
DSR* (Data Set Ready) is a general purpose
input that is used for modem control. This line
is not used when a printer is connected.
DTR* (Data Terminal Ready) is a general
purpose output to indicate the Analyzer is ready
to receive more data on the RXD line.
RTS* and CTS* (Request-To-Send, Clear-To-
Send) are handshaking signals used in RS232
communications.
RXD (Receive Data) input signal is the data re-
ceived. If this connector is used as a printer
output, the RXD pin is not used.
TXD (Transmit Data) output signal is the data
being transmitted.
D-1
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