VTS Medical Systems HMI-WING EC Integration Manual page 4

Modbus rtu bus
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Binary output status read (code 2) - Function allows, with one message, to read many subsequent
addressed binary output statuses. The attempt to read an non-existing binary input leads to error message
Example: 1-5 output read
Request
Field name
Function code
Register address – high part
Register address – low part
Number of binary inputs – high part
Number of binary inputs – low part
Table 5: Exemplary binary input read
Input No.,
Value read
Input status
Table 6: Interpretation of binary input statuses
Memory Register read (code 3) – the Function allows, with one message, to read subsequently
addressed registers . An attempt to read a non-existing register leads to an error message.
Example: 108-110 register read
Request
Field name
Function Code
Register address – high part
Register address – low part
Number of registers – high part
Number of registers – low part
Table 7: Exemplary memory register read.
Hex
0x02
0x00
0x00
0x00
0x05
-
-
Hex
Bit
0
0
-
-
Response
Hex
Field name
0x03
Function Code
0x00
Bytes
Register value – high part (108)
0x6B
Register value – low part (108)
0x00
Register value – high part (109)
0x03
Register value – low part (109)
Register value – high part (110)
Register value – low part (110)
Response
Field name
Function code
Bytes
5-1 input status
-
5
4
3
0x19
0
1
1
0
- ON ON OFF OFF ON
Hex
0x02
0x01
0x19
2
1
0
1
Hex
0x03
0x06
0x02
0x2B
0x00
0x00
0x00
0x64
4

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