User manual - DRR450
17
reported in the following table can lead to malfunction.
Modbus RTU protocol features
Baud-rate
Selectable on par. 30
bd.rt.
Value 0: 1200bit/sec
Value 5: 28800bit/sec
Value 1: 2400bit/sec
Value 6: 38400bit/sec
Value 2: 4800bit/sec
Value 7: 57600bit/sec
Value 3: 9600bit/sec
Value 8: 115200bit/sec
Value 4: 19200bit/sec
Format
Selectable on par. 31
s.p.p.
Value 0: 8N1
Value 3: 8N2
Value 1: 8E1
Value 4: 8E2
Value 2: 8O1
Value 5: 8O2
Supported
functions
WORD READING (max 20 word) (0x03, 0x04)
SINGLE WORD WRITING (0x06)
MULTIPLE WORDS WRITING (max 20 word) (0x10)
RO = Read Only
R/W = Read/Write WO = Write Only
Modbus
address Description
Read
Write
Reset
value
0
Type of device
RO
EEPROM
1
Software version
RO
EEPROM
5
Slave address
R/W EEPROM
50
Automatic addressing
WO
-
51
System code comparison
WO
-
500
Loading default values (write 9999)
RW
0
1000 Process (tenth of degree)
RO
?
1001 Command setpoint (tenth of degree)
R/W EEPROM
1002 Alarm 1 setpoint (tenth of degree)
R/W EEPROM
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