IMP Pumps NMTC module - Manual (Page 33)

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NOTE: Any branch/derivative cable is considered unterminated. Keep them short, below 250m
combined for maximum speed and reliability.
7.6 Register block overview
NMTC Modbus RTU registers are grouped in the following register blocks:
Start
address
Register block Readable/Writeable Description
001
NMTC
configuration
R/W
Configuration of the NMTC
module.
021 NMTC status R
Status registers for the NMTC
module.
101 Pump control R/W Pump control registers.
201 Pump status R Status data from the pump.
301 Pump data R Measured data from the pump.
All addresses contain 16 bit (one Word) registers. Some are bit interpreted while others are
combined for a 32 bit value.
NOTE: All register addresses are 1-based. Address 001 is thus transmitted over bus as 0x0000.
7.7 NMTC Configuration register block
Registers in this block are read with either function codes 0x03 or 0x04. They can be written as
holding registers with function codes 0x06 and 0x10.
NOTE: All values in this block are stored in nonvolatile memory immediately after write.
NOTE: See section “4.3 Module mode selection” an use Mode 8 or 9 to restore default settings if
you cannot access the controller after writing to these registers.