Something doesn't work with your wiring:
Max232 pin 10 should be connected to pic 16F690 pin 10 (RB7 Tx)
Max232 pin 9 should be connected to pic 16F690 pin 12 (RB5 Rx)
Connect a decoupling capacitor 10nF from Vdd to Vss on pic power pins.
Al.
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Something doesn't work with your wiring:
Max232 pin 10 should be connected to pic 16F690 pin 10 (RB7 Tx)
Max232 pin 9 should be connected to pic 16F690 pin 12 (RB5 Rx)
Connect a decoupling capacitor 10nF from Vdd to Vss on pic power pins.
Al.
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