Teledyne GC-Pro/TCD - Gas Chromatograph User Manual
Page 42

Installation GC-ProTCD
Teledyne
Analytical
Instruments
28
pin #
Description
pin #
Description
20 Alarm 3 C Contact
45
Alarm 1 NC Contact
21 IDLE Contact 1 (one shot only)
46
Alarm 1 NO Contact
22
MEASUREMENT Contact 1 (one
shot only)
47
23 - Output 0-1 v (Channel 2)
48
Exhaust Solenoid Return
24 + Output 0-1 v (Channel 1)
49
25
50
Sample Solenoid Return
3.3.2.10
RS-232
P
ORT
The digital signal output is a standard RS-232 serial communications
port used to connect the analyzer to a computer, terminal, or other digital
device. It requires a standard 9-pin D connector.
Input: The input functions using RS-232 that have been implemented
to date are described in Table 3-7.
Table 3-9: Commands via RS-232 Input
Command Description
AS <enter>
Auto Span immediately (continuous mode)
SV <enter>
Switch to Span Valve
ZV <enter>
Switch to Zero Valve
AV <enter>
Switch to Analyze Valve
C1 <enter>
If in 1Shot mode, start a cycle
C2 <enter>
If in 1Shot mode, start a span cycle
PMA <enter>
Switch to standard message
PMB <enter>
Switch to TCD output mode
PMC <enter>
Switch to Query Mode (used for interface with
OPC server)
Implementation: The RS-232 protocol allows some flexibility in its
implementation. Table 3-8 lists certain RS-232 values that are required
by the Standard Mode GC-Pro TCD implementation.
Table 3-10: Required RS-232 Options
Parameter Setting
Baud
9600
Byte
8
bits