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RS-232 — USB COM
ACK/NACK Protocol
The transmission protocol takes place between reader and Host. Once the reader has read a
code, it emits a good read beep and passes its data to the Host.
When ACK/NACK is disabled, there is no control from reader to Host transmission.
When ACK/NACK is enabled, the Host sends an ACK character (06 HEX) in the case of good
reception or the NACK character (15 HEX) requesting re-transmission, in the case of bad
reception.
If the reader does receive an ACK, no signal will be emitted; whereas, if it does not receive an
ACK or NACK, it will emit a wrong reception tone after a few seconds.
Gryphon D432/D412Plus reader cannot read barcodes while waiting for the Host response.
RX Timeout
This parameter can be used to automatically end data reception from the Host after the specific
period of time.
If no character is received from Host, after the timeout expires, any incomplete string (any
string not terminated by <CR>) is flushed from the device buffer.
USB Keyboard
Keyboard Speed
This parameter manages the transmission speed of characters to the Host. A fast Keyboard
Speed allows rapid transmission of a great amount of characters (for example 2D codes), but it
might not be compatible with slower systems.
Product Reference Guide
Chapter 5
References
113
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