YOKOGAWA UTAdvanced Series, User Manual

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IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3
3.2.3 Configuration of Responses
The UTAdvanced responses to commands sent from a host computer are configured as
shown below according to whether execution of operation is normal or ends in error.
When data outside the parameter setting range is set, the response is a normal
response, but the data is not written.

Response in a normal state
When communication is executed normally, the text string “OK” and data corresponding
to the command are returned.
With write commands, parameter data area is not provided.
Number of bytes 1 2 2 2 Variable length 2 1 1
Element STX Address No.
(ADR)
CPU No. (01) OK Parameter data Checksum ETX CR

Response in an error state
When communication is not executed normally, the text string “ER” and an error code (EC1
or EC2) are returned. (See “3.2.4 Response Error Codes.”)
• There is no response (no reply) for address No. specification errors and CPU No.
specification errors.
• Responses are sometimes not made (no reply) when the ETX in a command is not
received.
Note: As a measure for the above, execute time-out processing by the communication function or in
the communication program on the host computer.
Number of bytes 1 2 2 2 2 2 3 2 1 1
Element STX Address No.
(ADR)
CPU No. (01) ER EC1 EC2 Command Checksum ETX CR
3.2 PC Link Communication