Uv Signal Count (0Dh); Ir Signal Count (0Eh); Remote Reset (11H); Remote Alarm Test (12H) - MSA FL500 Operating Manual

3.13. UV Signal Count (0DH)

A Read command sends back the number of UV signal counts that have occurred within 500 ms, which is
the time necessary to detect a fire in the UV spectrum.

3.14. IR Signal Count (0EH)

A Read command sends back the number of IR signal counts that have occurred within 500 ms, which is the
time necessary to detect a fire in the IR spectrum.

3.15. Remote Reset (11H)

A Write command of 1 enables the Remote Reset bit to reset the Alarm Low and Alarm High relays. The
function is enabled momentarily and resets automatically after use.
Function
Enable
Disable
EXCEPTION: If an illegal data value is entered, Exception Code 03 (Illegal Data Value) is sent back.

3.16. Remote Alarm Test (12H)

A Write command of 1 enables the Remote Alarm Test. The Remote Alarm Test activates the Alarm Low
and Alarm High relays and causes the analog current to show Alarm Low then Alarm High.
When the Remote Alarm Test is complete, do the following:
1. Send a Write command of 0 to the Remote Alarm Test bit to disable the Remote Alarm Test.
2. Send a Write command of 1 to the Remote Reset bit to reset the Alarm Low and Alarm High relays.
Function
Enable
Disable
EXCEPTION: If an illegal data value is entered, Exception Code 03 (Illegal Data Value) is sent back.

3.17. Unit Temperature (13H)

A Read command sends back the temperature of the FL500 in degrees Celsius.

3.18. Clear COPM Faults (14H)

A Write command of 1 enables the Clear COPM Faults bit to reset both UV and IR COPM fault output. The
function is enabled momentarily and resets automatically after use.
Function
Enable
Disable
EXCEPTION: If an illegal data value is entered, Exception Code 03 (Illegal Data Value) is sent back.
Bit (LSB) Access
1 Read/Write
0 Read/Write
Bit (LSB) Access
1 Read/Write
0 Read/Write
Bit (LSB) Access
1 Read/Write
0 Read/Write
FL500 Modbus Communication Operating Manual
Operational Mode Command Register Details
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