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APPENDIX A-5: MODBUS Register Map (05623D DCN5839) T700, M700E Calibrator Manuals
A-30
MODBUS
Register Address
(dec., 0-based)
Description Units
MODBUS Discrete Input Registers
(single-bit; read-only)
0 System reset warning
1 Box temperature warning
2 Photometer lamp temperature warning
3 O
3
generator lamp temperature warning
4 Permeation tube #1 temperature warning
3
5 Photometer reference warning
6 Photometer lamp stability warning
7 O
3
generator reference detector warning
8 Regulator pressure warning
9 Any MFC pressure outside of warning limits
10 Any MFC drive less than 10% of full scale or greater than full scale
11 Any MFC sensor offset greater than allowable limit
12 Rear board communication warning
13 Relay board communication warning
14 Valve board communication warning
15 O
3
generator or photometer lamp I
2
C driver chip communication warning
16 Front panel communication warning
17 Firmware is unable to communicate with any MFC
18 Analog calibration warning
19 System is OK (same meaning as SYSTEM_OK I/O signal)
20 O
3
generator not yet stabilized
21 Permeation tube #2 temperature warning
1
MODBUS Coil Registers
(single-bit; read/write)
00-99
Trigger execution of sequence whose name begins with “00” - “99”. Turning a coil on executes a
sequence. Turning a coil off does nothing. When reading coils, the value indicates which
sequence is executing. If a coil is on, the sequence is executing; if off the sequence is not
executing. Supports nested sequences, so multiple sequence coils may be on simultaneously.
100
Turning coil on turns on purge. Turning coil off does nothing. When reading coil, the value
indicates whether purge is active. If on, purge is active; if off, purge is not active. Purge may be
invoked within a sequence, so purge coil may be on at the same time as a sequence coil.
101
Turning coil on puts instrument in standby. Turning coil off does nothing. When reading coil, the
value indicates whether instrument is in standby mode. If on, instrument is in standby; if off,
instrument is not in standby.
200-211
Connected to the control outputs (CONTROL_OUT_1– CONTROL_OUT_12). These coils may
be turned both on and off. Reading the coils indicates the current state.
1
Dual permeation tube option.
2
Low range option.
3
Permeation tube option.
06873B DCN6388