Trane PIC - Modbus Functions and Configuration

Operation
47BAS-SVX08D-E4
Modbus Functions
Function 2: Read n bits
Inputs are addressed starting at zero: input 10001 is addressed as 0.
Function 4: Read
n analog values
Registers are addressed starting at zero: register 30001 is addressed as 0.
Function 5: Write a bit
Function 15: Write
n bits
Coils are addressed starting at zero: coil 00001 is addressed as 0.
Function 6: Write a remote setpoint
Function 16: Write
n remote setpoints
Registers are addressed starting at zero: register 40001 is addressed as 0.
Modbus Configuration
There are 2 blocks of dip switches dedicated to Modbus configuration.
Dip switch block SW3: Serial Type, Parity, Baudrate
Dip switch block SW4: Modbus slave address
CONFIGURATION
SW1 SW2 SW3 SW4
ON
ON
1
2
3
4
5
6
7
8
OFF
SW3 SW4
ON
1
2
3
4
5
6
7
8
Modbus parameters - SW3
Table 17 - SW3 - Modbus configuration
12345678
Serial Type
RS232 ON
Reserved
RS485 OFF
Parity Check
None OFF OFF
Odd ON ON
Even OFF ON
Baudrate
1200 OFF OFF OFF
2400 ON OFF OFF
4800 OFFONOFF
9600 ON ON OFF
14400 OFF OFF ON
38400 OFF ON ON
57600 ON ON ON