102
Sec
tion
5
How to Use Command
L
in
k
Un
it
V7
00-
L1
2
V500-R521B2/C2
User’s Manual
Section 5
Example of System Configuration
Multi-connection port specification
When plural bar code readers are connected to one RS-232C port of the upper
equipment, connect to a multi-connection port of other link unit.
When the upper equipment has the RS-485 port, connect this port to act as upper
connection port. However, when the multi-connection port is used as the upper
connection port, the upper connection port (RS-232C) of the link unit cannot be used.
GR (frame ground) terminal is also on this port.
Pin arrangement
Item
Specification
Connector specification
5 pin special connector (accessory for the link unit)
Cable length
Total length: Max. 1 km
Communication system
In compliance with RS-485
Synchronous system
Asynchronous system
Communication control system
One-to-N procedure dedicated to OMRON
Communication speed
4800/9600/19200/38400 bps (Set with DIP-SW)
Character format (fixed)
Start bit
Data bit
Parity bit
Stop bit
Total
1
8
None
1
10
Error detection system
FCS (Frame Check Sequence)
Pin No. Signal name
Function
5
-
Short circuit with terminal 2 inside the circuit
4
+
Short circuit with terminal 1 inside the circuit
3
GR
Frame ground
2
-
Short circuit with terminal 5 inside the circuit
1
+
Short circuit with terminal 4 inside the circuit
When connecting with RS-485 interface of the upper equipment
The upper equipment should be in data reception condition within 15 ms after data transmission.
This control should be performed for normal operation.
0
GR (frame ground) terminal is in the multi-connection port.
D type grounding (former type 3 grounding) should be performed.
5
4
3
2
1
V500-R521.book 102 ページ ２００８年７月１８日 金曜日 午後１時１分
