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PRO-TC-MAN-17V01 (0802) Copyright © 2017 Define Instruments
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ASCII string. If it was a write command, CR/LF is the only response sent back.
The host must wait for this before sending further commands to the controller.
If the controller encounters an error, it will respond with a null (0x00) CR/LF.
A.2 - Modbus (RTU) mode
Modbus (RTU) is an industry standard RTU slave mode that allows connection to a
wide range of devices. Modbus registers are all holding registers, and should be ac-
cessed via function codes 3 and 6.
Register addresses are displayed in the Modicon™ 5-digit addressing format. I.e.
Register 65=400065 (subtract 1 for direct addressing).
8 Bit Unsigned
Address Function
408207 Baudrate
408211 Serial address
408215 Serial mode
16 Bit Unsigned
Address Function
404181–
404184 Hysteresis (SP1=404181, SP2=
404182, SP3=404183, SP4=
404184)
404197–
404200 Make delay (SP1=404197, SP2=
404198, SP3=404199, SP4=
404200)
32 Bit Signed (2 x 16 Bit)
LSW MSW Function
400007 400008 Temperature CH 1
400017 400018 Temperature CH 2
400019 400020 Temperature CH 3
400021 400022 Temperature CH 4
400039 400040 Average temperature
400057 400058 Peak
400059 400060 Valley
400111 400112 Setpoint 1
400113 400114 Setpoint 2
400115 400116 Setpoint 3
400117 400118 Setpoint 4
400239 400240 Alarm status
40587 40588 D/A scale low value
40591 40592 D/A scale high value
Modbus (RTU) Registers -
Active for models with relay output installed
Note: Address 416543 is a read/write null terminated text string, into which you can write
your own identification text (up to 62 characters). This is accessed using a standard Modbus
read/write command for holding registers, where each 16 bit register holds 2 x ASCII string
characters in sequence.