Communication Protocol Parameters
Communication stations - Communication protocol parameters
Parameters depending on the protocol type determine the communication protocol behavior during communication with the station. Parameters are entered into the Protocol parameters textbox in the form:
PRM1=value;PRM2=value etc.
PRM1, PRM2 - names of parameters
In the following table, the most commonly used protocol parameters are described together with the explanation of function. These are used mainly for asynchronous protocols of Request/Response type. Particular types of supported parameters for individual protocols can be found in the documentation of protocols.
parameter | name | meaning |
|---|---|---|
RC | Retry Count | The maximum number of request's repeats, if no response to the request is received. |
RT | Retry Time [ms] | Time (in milliseconds) of request delay if the previous response is evaluated as invalid. |
WFT | Wait First Time [ms] | The first delay before reading a response after request transmission is finished. |
WT | Wait Time [ms] | Delay between individual data readings from the communication line before the response is completed. |
MWR | Max Wait Retry | The maximum number of response reading repeats from the communication line before the response is completed. Between readings, there is a WT delay. |
A | A request is repeated at most RC times. |
B | The first WFT delay after message transmission. |
C | The next WT delays are repeated at most MWR times. |
D | If the response is not valid, there is an RT delay and the request is repeated. |