D374-20-880 Issue E
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Serial Interface Operation
5.3.2 Alarm status query message (?A)
Send this query message to determine the alarm status of the selected parameter.
5.3.3 Bitfield status query message (?B)
Send this query message to determine the bitfield status of the specified parameter. The {bitfield status} part of the
reply message specifies the status. Refer to Table 11.
5.3.4 Control status query message (?C)
Send this query message to determine if the serial interface card has control of the dry pumping system. The {on/
off} part of the reply message is set as follows:
z {on/off} = 0 means that the serial interface card does not have control of the system.
z {on/off} = 1 means that the serial interface card has control of the system.
5.3.5 Gas ballast status query message (?D)
Send this message to determine the gas ballast status. The {on/off} part of the reply message is set as follows:
z {on/off} = 0 means that the gas ballast is off.
z {on/off} = 1 means that the gas ballast is on.
5.3.6 Format mode query message (?F)
Send this query message to determine if short or long replies are selected. The {on/off} part of the reply message is
set as follows:
z {on/off} = 0 means that short replies are selected.
z {on/off} = 1 means that long replies are selected.
Table 12 - Status Level
Value Meaning
0Switched off
1 Off, switching on
2 On, switching off (shut down after fault)
3 On, switching off (normal shut down)
4On
Table 13 - Typical Control Object Values
Value Meaning
0No module has control
91 Single Pumpset Monitor has control
101 Pump Display Module has control
102 Remote Display has control
121 Parallel (tool) interface has control
181 Serial interface has control
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