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Teledyne API Model 465L O
3
Monitor Operation Manual
05509F DCN6409 61
8.6. MODBUS Register Maps
8.6.1. MODBUS Commands Supported
Table 8-6 lists the MODBUS commands that are supported by the M465L.
Note that the “Write” commands will only work with registers that are
configured as Read/Write, see Section 8.6.4. The “Read” commands can be
used with any register.
Table 8-6: Supported MODBUS Commands
MODBUS
Function Code
Description
01 Read Coils
02 Read Discrete Inputs
03 Read Holding Registers
04 Read Input Registers
05 Write Single Coil
06 Write Single Register
15 Write Multiple Coils
16 Write Multiple Registers
8.6.2. Notes on MODBUS registers
Concentration values in the MODBUS registers are always expressed in units of PPB (parts-
per-billion,) regardless of the concentration units setting of the monitor.