Teledyne GC-Pro/TCD - Gas Chromatograph - 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 Auto Span immediately (continuous mode)
SV Switch to Span Valve
ZV Switch to Zero Valve
AV Switch to Analyze Valve
C1 If in 1Shot mode, start a cycle
C2 If in 1Shot mode, start a span cycle
PMA Switch to standard message
PMB Switch to TCD output mode
PMC 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