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APPENDIX A-6: MODBUS Registers Teledyne API - Models T703, T703U, 703E MENU TREES (05745E DCN6572)
A-26
MODBUS
Register
Address
(dec., 0-based)
Description Units
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
Regulator pressure monitoring option.
07223C DCN6572