Omron MicroHAWK V320-F User Manual

Appendices
D-6
MicroHAWK V320-F / V330-F / V420-F / V430-F Barcode Reader User Manual
D-5 ACK/NAK Options
The following are general outlines of the ACK/NAK protocol. Items that are framed by brackets ( [ ] )
can either be disabled or enabled. LRC does not include STX, but it does include preamble, postamble,
and ETX.
TX to host: [STX] [preamble] SYMBOL DATA [postamble] [ETX] [LRC]
Response from host: ACK/NAK. Sent when LRC, ETX, postamble, or timeout (waiting for more data)
are detected (if REQ is disabled) depending on what is enabled.
TX to Reader: [STX] <command> [ETX] [LRC]
Response from Reader: ACK/NAK. Sent when LRC, ETX, or command-ending angle bracket ‘>’ are
received, depending on what is enabled.
TX to host: [STX] [preamble] COMMAND RESPONSE DATA [postamble] [ETX] [LRC]
Response from host: ACK/NAK. Sent when LRC, ETX, postamble, command-ending angle bracket
‘>’, or timeout (waiting for more data) are detected, depending on what is enabled.
As with Polling Mode <K140,5>, the reader can optionally perform the REQ and RES event
sequences in ACK/NAK mode. If the sender does not receive an ACK or NAK, it will send REQ to
request such a response (if enabled). When the sender receives an ACK, too many NAKs, or times out
(if already enabled), it will send a RES (if enabled) to terminate the transaction.
•Note: See ACK/NAK Data Flow Examples for sample ACK/NAK communication scenarios.
Definition: These parameters take effect for ACK/NAK <K140,4> on the main RS-232
port and are completely independent of the
Polling Mode Options <K148> .
The reader always follows the protocol in both directions (to and from the
host). There is no option to disable it from either direction.
Serial Cmd: <K147,RES,REQ,STX,ETX,ACK,NAK>
D-5-1 RES-NAK Defaults
RES: (Reset) 00 (disabled)
REQ: (Request) 00 (disabled)
STX: (Start of Text) 00 (disabled)
ETX: (End of Text) 00 (disabled)
ACK: (Acknowledge) 06
NAK: (Negative Acknowledge) 15
Symbol Data Output
Commands from Host to Reader
Command Response from Reader to Host

Omron MicroHAWK V320-F Specifications

General

Brand	Omron
Model	MicroHAWK V320-F
Category	Barcode Reader
Language	English