Operation I 4-19
4
Operation
Modbus Option Parameters
Register Command Poll Select Description
8018 Supply Temperature Retransmit Range Low (°C) R Floating Point
8020 Supply Temperature Retransmit Range High (°C) R Floating Point
8022 Low Temperature Safety – User Set (°C) R/W Floating Point
8024 High Temperature Safety – User Set (°C) R/W Floating Point
8026 Proportional Band (°C) R/W Floating Point
8052 Pump Running Hours R Floating Point
8054 Setpoint Temperature (°C) R/W Floating Point
8056 Low Temperature Safety – Factory Set (°C) R Floating Point
8058 High Temperature Safety – Factory Set (°C) R Floating Point
8070 Supply Temperature Input Offset R Floating Point
8072 Return Temperature Input Offset R Floating Point
8074 Remote Setpoint Temperature Input Offset R Floating Point
8080 Remote Setpoint Limit Temperature (°C) R Floating Point
8082 Remote Setpoint High Temperature Limit (°C) R Floating Point
Modbus Registers
The following is a list of Modbus Registers that are remotely available.
Notes:
• There is a limitation on the maximum Modbus block size of 40 for integers and 20
for floats.
• Additional settings include:
– Baud: Set by parameter bU, 9600 baud by default.
– Parity: None
– Data bits: 8
– Stop bits: 1
– Flow control: None
• It is common for external software to apply an address offset of “1”, so you may need
to add “1” to the Modbus addresses based on the software in the remote system.
• In newer versions of Modbus, you may have to append a “4” or a “40” prefix on the
registers listed.
For example, to get to “MACHINE STATE” in register 4002, you may have to access
register 4002, 4003, 44002, 44003, 404002, or 404003. Once you test your system and
get a valid response, you will know the rules to consistently apply to your system for all
addresses.
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