GE GE314 Operating Manual page 32

Fingerprint access controller
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9.1.8 COMMUNICATION TEST
☞ Before this communication test, connect RS232-RX and RS232-TX wires together.
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☞ This test is a loop test and GE314 sends a character to RS232-TX and check whether the RS232-RX receive
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the same character or not. If you have an error, contact manufacturer for technical support.
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