D374-20-880 Issue E
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Serial Interface Operation
5.3.12 Pump status query message (?P)
Note: Use the “?V12” query message to determine the status of the mechanical booster pump (if fitted).
Send this query message to determine the status of the dry pump in the dry pumping system. The {status level} part
of the reply message specifies the pump status. Refer to Table 12.
Note: If {alarm type} in the reply message is set to 0 (no alarm), {priority level} will also be set to 0. {priority
level} will only be set to the actual priority level when {alarm level} >0.
5.3.13 Run til crash status query message (?R)
Send this query message to determine whether run til crash is selected or not. The {on/off} part of the reply message
is set as follows:
z {on/off} = 0 means that Run til crash is not selected.
z {on/off} = 1 means that Run til crash is selected.
5.3.14 Serial number query message (?S)
Send this query message to determine the serial number of the dry pumping system. The serial number is specified
in the reply message.
5.3.15 Pump node type query message (?T)
Send this query message to determine the pump node type and/or the pumping system type, and/or the type(s) of
pump(s) in the pumping system. The fields of the reply message identify the appropriate data. Refer to Table 8.
5.3.16 Inlet purge status query message (?U)
Send this query message to determine the inlet purge status. The {on/off} part of the reply message is set as follows:
z {on/off} = 0 means that inlet purge is off.
z {on/off} = 1 means that inlet purge is on.
5.3.17 Value query message (?V)
Send this query to determine the value of the selected parameter. The {value} part of the reply message specifies
the current value of the parameter. Refer to Table 9 for the applicable measurement unit for the parameter.
Note: If you send this query message for parameters 176 (inverter status) or 245 (GRC status), the {value} part of
the reply message comprises eight hexadecimal digits, the meaning of these digits depends on your inverter
or GRC equipment.
5.4 Command Messages
5.4.1 Message syntax
The command messages are shown in Table 14. The messages are described in Section 5.4.2 to 5.4.9. The bracketed
items in Table 14 ({0:1} and {0:2}) are variable items that must be specified, as follows:
z {0:1} is a digit and can be 0 or 1.
z {0:2} is a digit and can be 0, 1 or 2.
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