I have 3 micro controllers 1 master and two for the slaves. I have to =
control for the slaves to acquire data. I use the USART of PIC16F877. =
The routine of my program goes like this...

For the master...

The master transmit when the switch in RB6 is switch to set.
The master broadcast transmit a Preamble, Acquire, for both slaves to =
acquire ADC
The master transmits again to acquire the value from one slave, lets say =
slave A, format of packet is preamble, acquire, address for slave A '0F'
The master receives the value from slave A beginning from preamble, =
acquire, address, and data.
The master transmits again to acquire the value from slave A, same =
format of packet is preamble, acquire, address for slave B 'F0'
The master receives the value from slave A beginning from preamble, =
acquire, address, and data.
The master displays both value on the data, clock, strobe of CD4094, =
which is a serial in parallel out driver.
Then I type a goto command before the command end.

For the slaves only differs the address.

The slaves receives the data being transmitted by the master and after =
receiving performs ADC. format of packet preamble, acquire
The slave receives the data again coming from the master and compare the =
the address. format of packet preamble, acquire, address
If it is address to the slave, it transmits back. If its not for it, it =
just ignore what it receives. format of packet premble, acquire, =
address, data
Then I loop back before the END commands to the portion where after my =
initialization of ports and USART is written

The problem...

The slave does not receive back again after transmitting

Question...=20
what must be my problem?

Hint:

I use preamble because I run the program with a power line modem.

I hope you can help me....

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