Yokogawa JUXTA M Series Digital Limit Alarms MVTK - Manual (Page 17)

<3. PC Link Communication >
3-3
IM 77J04J11-01E 1st Edition : 2006.08.25-00
3.1.2 Configuration of Response
Responses from the M Series with respect to a command sent from the higher-level device
consist of the following elements, which differ depending on the condition of communica-
tion; normal or failure.
1) Normal Communication
If communication succeeded, a character string "OK" is returned with the data correspond-
ing to a command.
Number of Bytes Variable length 1 2 2 2 2 1 1
Element STX Address
number
(ADR)
CPU
number
01
OK Parameter data Checksum ETX CR
2) In the Event of Failure
If communication failed, a character string "ER" is returned with error codes (EC1 and
EC2). (See subsection 3.1.3, "Response Error Codes.")
• No response is returned in case of an error in address number specification or CPU
number specification.
• If ETX in a command cannot be received, a response may not be returned.
Note: As a countermeasure, provide a timeout process in the communication functions of the higher-level device or in
communication programs.
Number of Bytes 1 2 2 2 2 2 3 2 1 1
Element STX ER EC1 EC2 Command Checksum ETX CR Address
number
(ADR)
CPU
number
01