OxyDetect Oxygen Deficiency Gas Detector
Appendix
05311001B / Revision 4
75
Register
Name
Comments
147 – 148
Alarm 1 level
Float.
149 – 150
Alarm 1 hysteresis
Float.
151
Alarm 2 mode
0 = none, 1 = low, 2 = high.
152
Alarm 2 latching
0 = no, 1 = yes.
153 – 154
Alarm 2 level
Float.
155 – 156
Alarm 2 hysteresis
Float.
A3.13 System control
System control will be provided using a block of coils that can be written to using
function code 05. Reading the same coils with function code 01 provides status
information.
Coil
Name
Comments
1
Floating point order Changes the order of the Modbus registers when
dealing with 32-bit floating point numbers.
0 = big-endian, e.g. 40001 = high word,
40002 = low word (default).
1 = little-endian, e.g. 40001 = low word,
40002 = high word.
2
User interface busy 0 = idle (on main screen),
1 = busy, user interface is in use.
Write 1 to stop the user interface (keys) being used.
A3.14 Transducer control
Transducer control will be provided using a block of coils that can be written to using
function code 05. Reading the same coils with function code 01 provides status
information. A block of 100 coils is reserved for each transducer as follows:
Coil
Name
Comments
101 – 200
Transducer 1
