MKS Baratron DMA Series, Инструкция по эксплуатации

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11BAppendix C: Command Summary 83BSupported Service Summary
109
Unlock
The password protected Unlock service (ID #4E)—valid only for the S-Device Supervisor
Object—places the device into the Calibration Mode, which enables you to modify certain read-
only attributes of the device. Table 60 lists the parameters for this service.
Table 60: Unlock Service Parameters
Parameter Request Response
Service
Data Type Description
Password Key Mandatory Mandatory UINT 1243
hex
= Calibration Mode
Perform Fine Zero Offset (0x4B)
The Perform_Fine_Zero service (ID #0x4B)—valid only for the S-Analog Sensor Object—
remotely zeros the device. Specifically, this service instructs the S-Analog Sensor Object to
modify the Zero Offset attribute (Attribute ID #06) so the current pressure reading in the
Corrected Pressure Value attribute (Attribute ID #06) is 0.0. There are no additional parameters
required for this service, although service data may be included if the target pressure is non-zero.
Table 61: Perform Fine Zero Offset Parameters
Parameter Request Response
Service
Data Type Description
Target Pressure Mandatory Mandatory INT or
REAL
Target pressure for offset (zero)
adjustment, usually zero.
The three possible ways to issue the Fine_Zero_Offset service request are shown below.
Table 62: Ways to Issue the Fine_Zero_Offset Service Request
Service Code Class Instance Service Data
0x4B 0x31 0x01 None, a target of zero will be assumed.
0x4B 0x31 0x01 00 00 – the target pressure represented as an INT
0x4B 0x31 0x01 00 00 00 00 - the target pressure represented as a REAL
This service is valid only when the Raw Pressure Value is within
±
2% of the full scale range of
the device. Refer to S-Analog Sensor Object , page 65, for more information.
Perform Coarse Zero Offset (0x32)
The Perform_Coarse_Zero service (ID #0x32)—valid only for the S-Analog Sensor Object—
remotely zeros the device. Specifically, this service instructs the S-Analog Sensor Object to
modify the Zero Offset attribute (Attribute ID #06) so the current pressure reading in the
Corrected Pressure Value attribute (Attribute ID #06) is 0.0. There are no additional parameters
for this service. (A target pressure of zero is always assumed.)
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