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6 No-protocol Mode
6-4
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Additional Information
• If there are multiple start codes, the first start code is enabled.
• If there are multiple end codes, the first end code is enabled.
• If the end code overlaps with the send/receive data and causes data reception to be inter-
rupted, use CR+LF as the end code.
• If the send delay is set when you send SerialSend instruction (No-protocol Mode), data can be
sent when the send delay time is elapsed after execution of the SerialSend instruction, as
shown below.
For details on the SerialSend instructions, refer to the NJ-series Instructions Reference Man-
ual (Cat. No. W502).
Precautions for Safe Use
If the system executes a no-protocol instruction to a serial communications port which is set for a
Serial Communications Mode other than No-protocol Mode, an instruction error will occur.
Connection diagrams are provided here. OMRON recommends the use of shielded twisted-pair cables
for actual wiring to enhance noise resistance. For details on wiring methods, refer to 3-3 RS-232C and
RS-422A/485 Wiring.
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RS-232C Connections to a Barcode Reader
6-1-3 Connections for No-protocol Mode
Send delay
SerialSend instruction
Send
Time
Signal
FG 1
SD 2
RD 3
RS 4
CS 5
DR 7
ER 8
SG 9
Pin
1 S D
2 R D
3 R S
4 C S
6 E R
7 S G
8 +5 V
D-sub 9-pin female connector
V520-RH21-6 Barcode Reader
DIN 8-pin connector
V509-W012 Cable
SG
+5 V
+5 V
External Power Supply
Example: 82S-0305
100 VAC
Serial Communications Unit
Pin Signal
Serial Communications
Unit/Board
V520-RH21-6
Barcode Reader
V509-W012
Extension Cable