Chapter 7 external communications, 1 introduction, 2 communications connection – INFICON Composer Gas Concentration Controller User Manual
Page 143: Chapter 7, Chapter 7, external, Communications, For command
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Composer Operating Manual
Chapter 7
External Communications
7.1 Introduction
The Composer supports RS-232C with Checksum.
7.2 Communications Connection
The Instrument System currently supports RS-232C communication only.
An industry standard 9-pin D-sub-miniature connector is required to connect to
the Controller. The length of the cable is limited to fifty feet according to
published standards. The communications interface operates using the DTE
(Data Terminal Equipment) configuration. See
and
for the
RS-232C connector’s pin assignments.
Figure 7-1 19-Pin Type “D” Female Connector
*Host
**IBM compatible computer connector
Table 7-1 RS-232C Connector’s Pin Connections
Pin#
Description
DB9*
DB25**
1
Not Used.
1
-
2 TXD
Data transmitted from controller.
2
3
3 RXD
Data received by controller.
3
2
4 DSR
Not Used.
4
-
5 GND
Signal ground.
5
7
6 DTR
Output from controller indicating ready for transmit.
6
6
7 CTS
Input to controller indicating stop transmitting.
7
4
8 RTS
Not used.
8
-
9 GND
Shield Ground.
9
-