Modbus Mapping Table - Baxi HP40-XX-MB Operation Manual

7 MODBUS MAPPING TABLE

7.1 Modbus Port Communication Specification
Port: RS-485; the wired controller XYE is the communication port for
connecting with the hydraulic module. H1 and H2 are the Modbus
communication ports.
Communication address: It is consistent with the DIP switch address of the
hydraulic module.
Baud rate: 9600.
Number of digits: Eight
Verification: none
Stop Bit: 1 bit
Communication protocol: Modbus RTU (Modbus ASCII is not supported)
7.1.1 Mapping of registers in the wired controller
The following addresses can use 03H, 06H (write single register),
10H (write multiple register)
Register Description
address
0 Power on or off.
(PLC:40001)
Remarks
BIT15 Reserved
BIT14 Reserved
BIT13 Reserved
BIT12 Reserved
BIT11 Reserved
BIT10 Reserved
BIT9 Reserved
BIT8 Reserved
Reserved
BIT7
Reserved
BIT6
BIT5 Reserved
BIT4 Reserved
0:
BIT3
power off heat pump
BIT2 0: DHW(T5S) power off; 1: DHW(T5S) power on
BIT1 0:
power off heat pump
BIT0 0: power off floor heating; 1: power on floor heating
24
; 1: power on heat pump (zone 2)
; 1: power on heat pump (zone 1)