OZONE ANALYZER BMT 965 Manual, Rev. 01/2024
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74
Write Coil Map – FC 05 (0x05), 16 (0x10)
Coil Description Comment
1 Low Alarm Enabled Write Single Coil (FC 05) is used to force a single output to ei-
ther ON or OFF. The requested state is specified by a constant:
ON – active – data field value 0xFF00
OFF – inactive data field value 0x0000
Write Multiple Coils (FC 16) is used to force each coil in a se-
quence of coils to either ON or OFF. The requested state is
specified by contents of the data field.
ON – active – logical 1 in bit position of the related data field
OFF – inactive – logical 0 in bit position of the related data field
Coils are addressed starting at zero – coil number 1 is ad-
dressed as 0.
Note: Attempting to write Coil 5 – Execute Zero will return the
exception code 04 in case of:
(1) Request OFF state or
(2) Request ON in case of Warming Up is active or
(3) Request ON in case of Zeroing is active
2 High Alarm Enabled
3 Low Alarm Latched
4 High Alarm Enabled
5 Execute Zero
Diagnostics – FC 08 (0x08)
Coil Description
0x00 Return Query Data
The Data passed in the request is looped back in the response. The entire response
message should be identical to the request.
The data field of the query should be two bytes long.
0x0A Reset Error Counters
0x0C Return Bus Communication Error Count
Returns the quantity of CRC errors since its last restart. The Reset Error Counters oper-
ation or power-on clear this counter.
0x0D Return Bus Exception Count
Returns the quantity of MODBUS exceptions since its last restart. The Reset Error
Counters operation or power-on clear this counter.
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