User`s guide

Installation and Setup
43
The ATD/TD Input/Output Port
The Input/Output Port of the ATD/TD enables communication with
other instrumentation, for example GCs and data handling systems.
The communication consists of a number of relay contact signals
provided by the ATD/TD, which can be read by the external device
and a relay contact signal provided by the external device, which is
read by the ATD/TD. Figure 1 shows the signal connections to the
ATD/TD Input/Output Port.
Figure 1 The ATD/TD Input/Output (I/O) Port
TD Output Signals
The Input/Output port of the ATD/TD enables communication with
other instrumentation, for example GCs and data handling systems.
Ready Out—These signals, which indicate the ATD/TD ready
status, are provided by a normally open relay. A contact closure
between pins 1 and 2 (Ready Out) signals that the ATD/TD is Ready,
or a contact break between pins 3 and 4 signals that the ATD/TD is
not Ready”.
Normally, the ATD/TD acts as the controller, and neither of the
above signals are connected.
Start—The Start (Inject) signal is a relay contact closure between
pin 5 and 6 (Start Out) and coincides with the start of trap heating.
14
13
12
11
10
9
8
7
6
5
4
3
2
Pin # 1
Ground
Ground
Ground
Start In
Stop In
Ready In
Fail Out Normally Open
Start Normally Open
Ready Normally Open
Ready Normally Open
Closed