YOKOGAWA UTAdvanced Series, User Manual

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3-13
IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3

08 Loopback test

Function
This is used to check the communication connection.
• For details on the response format at an error, see “● Response in an error state” in
“3.1.3 Configuration of Responses (response from UTAdvanced).”
• The diagnostics code is fixed at “0000.”
• Any data can be selected for the send data.

Message (during normal operation)
Element
Message
start mark
(:)
Address No.
(ADR)
Function code
(0x08)
Diagnostic
code
(0000)
Send data
(arbitrary)
Error
check
Message
end mark
(CR+LF)
Number of bytes in RTU mode None 1 1 2 2 2 None
Number of bytes in ASCII
mode
1 2 2 4 4 2 2

Response (during normal operation)
Element
Message
start mark
(:)
Address No.
(ADR)
Function code
(0x08)
Diagnostic
code
(0000)
Same as
send data
Error
check
Message
end mark
(CR+LF)
Number of bytes in RTU mode None 1 1 2 2 2 None
Number of bytes in ASCII
mode
1 2 2 4 4 2 2
3.1 Modbus Communication