Teledyne GC-Pro/TCD - Gas Chromatograph User Manual

Page 42

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background image

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

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