INFICON Composer Elite Gas Concentration Monitor - Manual (Page 68)

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Composer Elite Operating Manual
Only serial communications baud rate of 115,200 is supported.
The communications interface operates using the DCE (Data Communications
Equipment) configuration.
NOTE: Some RS-232 hardware/software combinations may occasionally
cause a command to not be recognized by Composer Elite.
Consequently, all communications should include an automatic retry
procedure if a response is not received within three seconds.
CAUTION
RS-232 uses single-ended signaling with all signals sharing
a common ground, making it susceptible to cross-talk and
noise if the RS-232 cable is not properly shielded and not
routed away from sources of noise. A very high data rate can
overwhelm the internal buffers of the computer, resulting in
data loss. Computer configuration (such as a power setting
that allows the computer to sleep during a run) can cause
data loss. Data loss can occur due to issues inherent to the
Windows operating system, including the diversion of
computer resources when Windows Automatic Update or
antivirus software checks for updates on the Internet.
Figure 5-1 9-pin type “D” female connector
Table 5-1 RS-232C 9-pin type "D" connector pin connections
Pin# Description DB9* DB25**
1 Not Used 1 -
2 TXD Data transmitted by the Sensor Control Unit 2 3
3 RXD Data received by the Sensor Control Unit 3 2
4 DSR Not Used 4 -
5 GND Signal Ground 5 7
6 DTR Not Used 6 6
7 CTS Not Used 7 4
8 RTS Not Used 8 -
9 GND Not Used 9 -
*Host
**IBM compatible computer connector
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