Addressing - Honeywell TWM 9000 Supplementary Instructions Manual

MODBUS PROTOCOL
6

6.3 Addressing

In the following tables the Modbus protocol addresses / data addresses are listed.
Some systems cannot use addresses above 9999. For these systems there is the possibility to
use the listed addresses but
• for Input Registers omit the leading 3 of 3xxxx;
• for Holding Registers omit the leading 4 of 4xxxx;
• for Input Registers replace the leading 20 of 20xxx by 9xxx.
Sometimes register numbers are asked for. The register numbers
1 to the protocol address and using a prefix according to the block:
• prefix 1 for coils
• prefix 3 for Input Registers
• prefix 4 for Holding Registers
6.4 Overview of supported functions
The following table shows Modbus functions supported by RS485 interface.
Function code Name
hex dec
01 01 Read Single Coil
03 03 Read Holding Register
04 04 Read Input Register
05 05 Write Single Coil
08 08 Diagnostics
10 16 Write Multiple Register
14
register numbers can be calculated by adding a register numbers register numbers
Access to
Status of calibration functions, counter
status (start/stop)
Converter configuration parameter
Measurement values, status values and
calibration results
Cold start, warm start, error reset, start
calibration function, start/stop counter
-
Converter configuration parameter
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TWM 9000
34-VF-25-22 iss.1 GLO Nov 09 US