Omron V430-F Series User Manual For Communication Settings page 108

5 Controlling Operation and Data Output with RS-232C
 Point-to-Point
It is a basic RS-232C communication protocol that does not control communication by a control
code.
External device
Character notation
Code Reader
 Point-to-Point with XOn/XOff
With this protocol, if the free space of the Receive buffer on the side receiving data becomes small,
it sends XOff (Hex:13) to the Data Transmit side to request transmission interrupt. When it has
enough free space again, it sends XOn (Hex:11) to the Data Transmit side to request Re-transmit.
External device
Request transmission interrupt
Character notation
Code Reader
 ACK/NAK
ACK/NAK Control Codes are an RS-232C communication protocol for confirming communication.
When data is received, an ACK (Hex:06) response is sent to the device that sent the data. When
data is not successfully received, a NAK (Hex:15) response is sent to the device that sent the data.
If the device that sent the data receives a NAK response, it re-transmits its data.
When the data was successfully received:
External device
Character notation
Code Reader
When the data was not received:
External device
Character notatiion
Code Reader
5 - 6
Serial Trigger command
< >
Hex notation 3C 20 3E
In Read Cycle
Character notation
Hex notation
Serial Trigger command
XOff <
Hex notation 13 3C 20
If XOff is received, data is not output until XOn is received.
Serial Trigger command
< >
Hex notation 3C 20 3E
ACK response
Character notation
ACK
Hex notation 06
Serial Trigger command
< >
Hex notatiion 3C 20 3E
ACK response
Character notatiion
ACK
Hex notatiion 06
V430-F Series Autofocus Multicode Reader User Manual for Communication Settings
Read result
1 2 3 4 5 CR LF
31 32 33 34 35 0D 0A
Request re-transmit
>
3E
In Read Cycle
Character notation
Hex notation
In Read Cycle Read result
1 2 3 4
5
31 32 33 34 35
In Read Cycle Read result
1 2 3 4 5
31
32 33 34 35
XOn
11
Read result
1 2 3 4 5 CR LF
31 32 33
34 35 0D 0A
ACK response
ACK
06
CR LF
0D 0A
NAK response
NAK
15
Read result
CR LF 1 2 3 4 5
0D 0A 31 32 33 34 35
When NAK is received, previous Output data is re-sent.
ACK response
ACK
06
CR LF
0D 0A