YOKOGAWA UTAdvanced Series, Руководство пользователя

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3-11
IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3

03 Reading multiple D registers

Function
The content of D registers is read continuously for the specified number of registers from
the specified D register No.
• The maximum number of registers that can be read at a time is 100.
• 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).”

Message (during normal operation)
Element
Message
start mark
(:)
Address No.
(ADS)
Function code
(0x03)
Register
start No.
Number
of read
registers
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.
(ADRS)
Function code
(0x03)
Byte count
(Note 1)
Register
content
• • •
Number of bytes in RTU mode None 1 1 1 2 • • •
Number of bytes in ASCII
mode
1 2 2 2 4 • • •
Continuation of response
Register
content
Error
check
Message
end mark
(CR+LF)
2 2 None
4 2 2
Note 1: Byte count = 2 x number of read registers
3.1 Modbus Communication