FCI ST100A Series, Installation, Operation And Maintenance Manual

Page: 74 / 170

OPERATION ST100A Series Flow Meter
66 Fluid Components International LLC
ST100A Series HART Common Practice Commands
The ST100A Series supports Common Practice commands 35, 40, 42, 44, 45, 46, 50 and 51.
Table 13 below summarizes the instrument’s
HART Common Practice command set and the data associated with each command.
Table 13 – HART Common Practice Commands
Command 35: Write Primary Variable (PV) Range Values
Byte Format Description
Request Data Bytes 0 Unsigned-8 PV Upper and Lower Range Values Units Code
1–4 Float PV Upper Range Value (Customer Max. Flow Limit)
5–8 Float PV Lower Range Value (Customer Min. Flow Limit)
Response Data Bytes
1
0 Unsigned-8 PV Upper and Lower Range Values Units Code
1–4 Float PV Upper Range Value
5–8 Float PV Lower Range Value
Response Codes See Table 17 , page 74 , for response code list.
Note: 1. The value returned in the response data bytes reflects the rounded or truncated value actually used by the device.
Notes: 1. Specify a value (in mA) to drive Ch. 1 to a particular output value. Specify “0” to exit the fixed current mode.
Note: 1. Send Command 42 (no data) to reset the instrument. No response is returned due to reboot.
Note: 1. The value returned in the response data bytes reflects the value actually used by the device.
Note: 1. The value returned in the response data bytes reflects the rounded or truncated value actually used by the device.
Command 40: Enter/Exit Fixed Current Mode
Byte Format Description
Request Data Bytes
1
0–3 Float PV Fixed Current Level (mA units); “0” to Exit Fixed Current
Response Data Bytes 0–3 Float Actual PV Current Level
Response Codes See Table 17 , page 74 , for response code list.
Command 42: Perform Device Reset (Soft Reset of Flow Meter)
1
Byte Format Description
Request Data Bytes None
Response Data Bytes None
Response Codes See Table 17 , page 74 , for response code list.
Command 44: Write Primary Variable Units
Byte Format Description
Request Data Bytes 0 Enum PV Units Code
Response Data Bytes
1
0 Enum PV Units Code
Response Codes See Table 17 , page 74 , for response code list.
Command 45: Trim DAC Zero – Measured Current Chan #1 (in mA)
Byte Format Description
Request Data Bytes 0–3 Float Ext. Measured Current Ch. #1 Level (4 mA Zero_DAC)
Response Data Bytes
1
0–3 Float Actual Measured Current Ch. #1 Level (4 mA Zero_DAC)
Response Codes See Table 17 , page 74 , for response code list.