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