Motorola DS3478 ユーザーズマニュアル

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11 - 12 Symbol DS3478 Product Reference Guide
Check for Decode LED
The attached decoder typically asserts the decode line to signal to the scanner emulation host that it successfully 
decoded the transmitted bar code. Some decoders, however, do not assert the decode signal upon a decode. In 
this case, the digital scanner emits transmit error beeps to indicate that the bar code did not successfully transmit. 
Scan the Ignore Decode LED bar code to disable the transmit error beeps.
*Check For Decode LED
Ignore Decode LED