Introduction 1
Troubleshooting and Maintenance Manual 15
Interfacing Start Events to External Devices
Remote control processor
The remote control processor on the LAN/MS control card synchronizes
start-run signals with GCs and other devices. The functions of the remote
control processor are extended to the remote start (Remote) connector
(Figure 4) on the back panel of the MS. The remote start cable connects the GC
and the MS. An optional cable can extend these events to another instrument.
Remote start signals
It is often necessary to communicate with external devices (for example, a
purge-and-trap) during a run. Typically, these communications are requests to
send a system-ready signal. They also include:
• Receive a start run signal from an external device
• Program the timing of events during a run
System ready
When interfacing to an external device, it is often desirable to send a
system-ready signal to the device. In the case of a multi-sample Tekmar
purge-and-trap, each sample is purged onto a trap where it waits for a ready
signal. On receipt of the ready signal, the desorption cycle begins. When a
specific temperature is reached, the purge-and-trap closes a contact to
indicate the run has started.
Figure 4 Remote start connector
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