Mastergenerator ModBus Functions
2005 Carlo Gavazzi Industri A/S. All rights reserved.102
Modbus-RTU interface
Modbus-RTU is implemented with the function of a slave. The following Modbus functions are
supported: 01, 02, 03, 05, 06 and 16. All 128 Dupline ® Digital, Analink, Counter, and BCD channels
are placed as follows:
Modbus-RTU Functions implemented in the Master Generator
Read Functions
Function Code 01: Read Output Table Bit (Data to Receivers)
Register
Address
Register 8 bit
Dec Hex
1280 500 A1 00=OFF Bit
1281 501 A2 01=ON Bit
Bit
1407 57F P8 Bit
Function Code 02: Read Input Table Bit (Data from transmitters)
Register
Address
Register 8 bit
Dec Hex
1536 600 A1 00=OFF Bit
1537 601 A2 01=ON Bit
Bit
1663 67F P8 Bit
Function Code 03: Read Multiple Registers
Register
Address
Register 16 bit
Dec Hex Hi Lo
00 B8..B1 A8..A1 Digital
11 DC Digital
.. . . .
66 NM Digital
77 PO Digital
Register
Address
Register 16 bit
Dec Hex Hi Lo
16 10 B8..B1 A8..A1 Digital
17 11 DC Digital
.. . . .
26 16 NM Digital
27 17 PO Digital
256 100 A1 0 0..255 Analink
257 101 A2 0 0..255 Analink
258 102 A3 0 0..255 Analink
...00..255 Analink
382 17E P7 0 0..255 Analink
383 17F P8 0 0..255 Analink
512 200 0 0..99 0..99 0..99 0..99 Counter
514 202 1 0..99 0..99 0..99 0..99 Counter
516 204 2 0..99 0..99 0..99 0..99 Counter
0..99 0..99 0..99 0..99 Counter
764 2FC 126 0..99 0..99 0..99 0..99 Counter
766 2FE 127 0..99 0..99 0..99 0..99 Counter
Reads information previously written by a Modbus command
for transmission on Dupline
Reading of only 1 register at a time is allowed.
Value : 0 or 1
Reads Dupline Output-Status.
Reading of only 1 register at a time is allowed.
Value : 0 or 1
Reads Dupline Output status.
Reading of 1 to 8 registers possible.
If an attempt is made to read from a start-address and the number of registers
exceeds the allowed register range, no answer will be made, as this is
interpreted as an illegal function
AnaLink values are readable. Irrespective of the configuration of the channels.
If a value is read as FFFFh, the Sensor is not present.
Reading of 1 to 32 registers possible
Counter value only valid if Counters are selected.
Value read in BCD
Reading of 1 to 32 registers allowed.
Reads Dupline Input status .
Reading of 1 to 8 registers possible.
If an attempt is made to read from a start-address and the number of registers
exceeds the allowed register range, no answer will be made, as this is
interpreted as an illegal function
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