QQ1: which transcievers do you use
QQ2: how far can the slaves be from the master


Q1: Is it a better way to use 31250 baud for serial communication?

While the system is running, once in a while, one of the slaves is not responding when it is being addressed. We are trying to trace it with the help of error log at the instance of card response failure. Once this happens, we are sending reset command to restart the whole system, as the system is not running properly, it happens 2-3 times in 24 hrs.
A1: do the slaves have a watchdog, if not give them one

Q2: What issues affect a slave from not responding to command Byte? what needs to be done to refresh the communication?
A2: malfunctioning code, noise, power glitches, ....

Q3. Are we using the correct way to communicate in Master Slave Application (as described in Philips datasheet) or better options are available to implement?
A3: my guess is that it will (mainly) be a hardware issue (transciever choice, power condintioning, noise immunity, ...)

Erii