pH ARC SensorsModbus 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 canbe read and written in register 4102.
Start
register Number of
registers Reg1/ Reg2 Modbus
function code Read
access Write
access
4102 2 Baudrate code
(definition seebelow) 3, 4, 16 U/A/S S
Figure 2.3.2.1.1:Definition of register 4102.
The codef ort hebaud 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 baudrate Modbusaddress: 4102 Length: 2Type: 3Read
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 canbe set by S (Specialist), default is 19200.
Command: Com baudrate Modbusaddress: 4102 Length: 2Type: 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 ratelimits 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 baudl imits Modbusaddress: 4104 Length: 4Type: 3Read
Parameter: Min Baud rate code Max Baud ratecode
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).