SCI PROBLEM ON HCS08

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SCI PROBLEM ON HCS08

Shinetop
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Hi Guys,
I've got a little problem with SCI on HCS08:
I've interfaced two MC9S08AW60 boards with a rs485 bus, I'm using an ST481 for the shift level.
The Board 1 send a message to board 2 and this board reply with anoter message, the system works fine for 30 seconds but after that time the RX on the board 1 hang-up. Board 2 turn on a led everytime she receive a message so thre problem is on board 2.
It's a sync problem?