Can I Increase the delay before "GatewayTargetDeviceFailedToRespond" error? #42

I have a serial connection to a Modbus Server and everything seems to work okay, but I seem to get a "GatewayTargetDeviceFailedToRespond". If I retry the operation, it seems to continue, but this causes the overall communication rate to be much slower than desired.
I tried using retries, retry, but the results seems to be the same.
I also tried modifying maxDataInterval, but again the results seemed to be similar.
What variable is used to decide how long to wait, before deciding the device failed to respond?
Is it one of the variables mentioned above?
Eric