Side Dishes; Modbus Communication; Modbus Rtu Specification - DEGA UDA III User Manual

8 Side dishes

Modbus communication

Modbus RTU specification

Node type
Baud rate
Data bits
Stop bits
Parity
Address
Protocol
Supported function code
Broadcast
Table 38 Modbus RTU specification
Modbus Modbus
address register
0 40001
... ...
5 40006
6 40007
... ...
9 40010
10 40011
11 40012
12 40013
1099 41100
1101 41102
1102 41103
1103 41104
1105 41106
1106 41107
1107 41108
1108 41109
1109 41110
... ...
1349 41350
Table 39 Mapping Modbus registers to device data
Bit7 Bit6
- Calibration
expired
Table 40 Alarm bitflags
Slave
9600
8
1
none
Can be set in DegaConfig
RTU
3 - read holding register
No
Type Name
STR12 SN
STR8 Product
WORD TO
WORD DI
INT16 Temperature
INT32 Channel 1,
10 registers
WORD
INT16
INT32
INT16
WORD
WORD
WORD
Channel 2
...
INT16 Channel 250
Bit5 Bit4
PEL2 PEL1
Description
Device serial number, string
Product name, string (UDAIII)
Digital outputs - status
Digital inputs - status
Equipment temperature [* 10 C]
Measured concentration [* 1000]
Alarms [bit flags]
Channel error code (0 - functional) - see the error
code appendix in the transmitter manuals
TWA concentration [* 1000]
Sensor temperature [* 10 C]
Reserve
Reserve
Reserve
10 registers, same structure as channel 1
10 registers, same structure as channel 1
Bit3 Bit2
Alarm4 Alarm3
75
Bit1 Bit0
Alarm2 Alarm1