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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 8 / 67
2.3.2 Baud Rate
2.3.2.1 Reading and Writing the Baud Rate
The baud rate can be read and written in register 4102.
Start
register
Number of
registers
Reg1 / Reg2 Modbus
function code
Read
access
Write
access
4102 2 Baud rate code
(definition see below)
3, 4, 16 U/A/S S
Figure 2.3.2.1.1: Definition of register 4102.
The code for the baud rate is defined as follows:
Baud rate 4800 9600 19200 38400 57600 115200
Code 2 3 4 5 6 7
Figure 2.3.2.1.2: Code for the baud rates.
Command: Com baud rate
Modbus address: 4102 Length: 2 Type: 3
Read
Parameter: Baud rate code
Format: Decimal
Value:
4
Figure 2.3.2.1.3: Example to read the baud rate code, 4 corresponds 19200 baud.
The baud rate can be set by S (Specialist), default is 19200.
Command: Com baud rate
Modbus address: 4102 Length: 2 Type: 16
Write
Parameter: Baud rate code
Format: Decimal
Value:
5
Figure 2.3.2.1.4: Example to set the baud rate to 38400 baud with code 5.
2.3.2.2 Reading the Baud Rate Limits
The baud rate limits can be read in register 4104.
Start
register
Number of
registers
Reg1 / Reg2 Reg3 / Reg4 Modbus
function code
Read
access
Write
access
4104 4 Min. Baud rate
code
Max. Baud rate
code
3, 4 U/A/S none
Figure 2.3.2.2.1: Definition of register 4104.
Command: Com baud limits
Modbus address: 4104 Length: 4 Type: 3
Read
Parameter: Min Baud rate code Max Baud rate code
Format: Decimal Decimal
Value:
2 7
Figure 2.3.2.2.2: Example to read the baud rate code limits: Min = 2, Max = 7 (see Figure 2.3.2.1.2).