Modbus Registers; Holding Registers - ABB LWT300 Series User Manual

—
A p p E N D I X B

Modbus registers

NOTICE
The map register offset in this Appendix is Base 0 (first register address is at 0).

Holding registers

The Holding registers consist of 16 bits. They can be read and written. The address (1 byte) is sent
before each command. A CRC (2 bytes) is sent after each command.
Register name Register
address
address 200
Baud rate 201
parity 202
Stop bit 203
Map Register 204
Offset
Delay time 206
Swap Mode 3000
Data type Value range
USIGN8 1 – 247
TABENUM8 1 = 1200
2 = 2400
3 = 4800
4 = 9600
5 = 19200
TABENUM8 0 = None
1 = Even
2 = Odd
TABENUM8 1 = One stop bit
2 = two stop bits
TABENUM8 0 = 0
1 = 1
USIGN8 1 – 200ms
TABENUM8 0 = aBCD,
1 = CDaB,
2 = DCBa,
3 = BaDC
Default Description
value
247 also known as Slave ID
4 = 9600 this is the baudrate used during Modbus
communication
0 this is the parity bit in the Modbus frame
1 this is the number of stop bits in the
Modbus frame
1 this offset is added from the address
received in the Modbus frame message.
Defines the register base number
50 ms Define the period of time before the LWt
sends out a response
1 = CDaB Define the byte order for the Floating
point Format Code register