Transmission Control Procedure - Fuji Electric PXR Series Instruction Manual

5.4 Transmission Control Procedure

(1) Transmission procedure of master station
The master station must proceed to a communication upon conforming to the following items.
(1-1) Before sending a command frame, provide 5 ms or more vacant status.
(1-2) For sending, the interval between bytes of a command message is below 1 second.
(1-3) Within 15 ms after sending a command message, the receiving status is posted.
(1-4) Provide 5 ms or more vacant status between the end of response frame reception and beginning of
next command frame sending [same as in (1-1)].
(1-5) For ensuring the safety, make a confirmation of the response frame and make an arrangement so as
to provide 3 or more retries in case of no response, error occurrence, etc.
Note) The above definition is for most unfavorable value. For ensuring the safety, it's recommended the
program of the master to work with safety factors of 2 to 3. Concretely, it is advised to arrange the
program with 10 ms or more for vacant status (1-1), and within 10 ms for byte interval (1-2) and
changeover from sending to receiving (1-3).
ata processing
of master station
ata
transmission
Signal status on
communication
Waiting time of master station : min.5ms
necessary (Recommended to have 10 ms or longer
Command
frame
Response time of slave ; 15 to 50 ms
－11－
Response
frame
Command
frame
More than 1 sec.
No response