D395-90-880 Issue E
Page 16
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OPERATION
4.6.4
Responses
Responses to commands will always be a message of the form "Errn". If the command syntax was correct the response
will be "Err0", confirming that there is no error.
Responses to queries will usually be a string containing the requested data. If the syntax is not correct an error
message of the form "Errn" will be returned. Refer to
for a list of error numbers.
4.7
Linking two ADCs (enhanced only)
4.7.1
Using two ADCs
Two ADCs may be linked together to allow automatic switching of one gauge by another, for example using an APG
gauge to switch an AIM gauge on and off.
z
Connect the controlling gauge (APG) to the Gauge 1 connector of the first ADC.
z
Set the set-point 1 thresholds to the required pressures.
z
Connect the controlled gauge (AIM) to the Gauge 1 connector of the second ADC.
z
Connect the two Gauge 2 connectors of the two ADCs together using a standard Active Gauge cable.
The ADCs will automatically recognise the linking cable, and the AIM gauge on the second ADC will switch on and off
at the pressures defined by the set point 1 thresholds of the first ADC.
4.7.2
Using one ADC
Two gauges may be linked together to allow automatic switching of one gauge by another.
z
Connect a controlling gauge to the ADC. (APG, APG100 and APGX Gauges)
z
Connect a controlled gauge to the ADC. (AIM-S and AIM-X Gauges)
z
Set the link threshold on the link menu.
The ADC will automatically recognise the two gauges as being a controlling/controlled pair and switch the controlled
gauge on and off at the pressures defined by the link thresholds.
The link thresholds default to above the operating range of controlling gauges, and will not trigger the controlled
gauge to turn on or off until the link thresholds are set within the operating range of the controlling gauge.
The controlled gauge can be manually turned on or off within the “ON” range defined by the link thresholds. When
the controlling gauge is above the high link threshold, manual operation of the controlled gauge is blocked until the
controlling gauge drops below the low link threshold again.
Table 10 - RS232 queries
Mnemonic
Meaning
Reply
?CH
Set-point high threshold
{pressure}
?CL
Set-point low threshold
{pressure}
?GA
Gauge pressure
{pressure}
?GV
Gauge version
{nn}
?RC
Relay controlling gauge
{1..2}
?TH
Link high threshold
{pressure}
?TL
Link low threshold
{pressure}
?US
Units
{0..3}
?VL
Voltage
{voltage}
