Omron V430-F Series User Manual For Communication Settings page 96

4 Controlling Operation and Data Output with RS-232C
Behavior of the Host Protocol
Description of how each Host Protocol behaves.
 Point-to-Point
Point-to-Point is a basic RS-232C communication protocol that does not control communication by
a control code.
External device
Character notation
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
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
Reader
• When the data was not received:
4 - 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
V430-F Series Auto Focus Multi Code Reader User Manual for Communication Settings (Z407-E1)
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
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