13
RS-422A/485 Port
Item
Specification
Communications method
Half duplex
Synchronization
Start-stop
Baud rate
1,200/2,400/4,800/9,600/19,200 bps
Transmission method
Point-to-multipoint
Transmission distance
500 m max.
Interface
Complies with EIA RS-422A/485
Pin No.
Signal name
Abbreviation
Signal direction
1
Send data –
SDA
Output
2
Send data +
SDB
Output
3
Unused
NC
–
4
Unused
NC
–
5
Unused
NC
–
6
Receive data –
RDA
Input
7
Unused
NC
–
8
Receive data +
RDB
Input
9
Unused
NC
–
Shell
Safety ground
FG
–
Note
When the 2-wire communications is set, use 1 and 2, or 6 and 8.
Connectors
Plug:
XM2A-0901 (OMRON) or equivalent
Hood: XM2S-0911 (OMRON) or equivalent
Note
One plug and one hood are provided.
Recommended Cable
AWG28
5P IFVV-SB (manufactured by FUJIKURA DENSEN)
CO-MAVV-SB 5P
AWG28 (manufactured by HITACHI DENSEN)
Line length: 500 m max.
1-1-11 Communications Modes and Transmission Paths
The following table shows the transmission paths that can be used for each of
the communications modes.
Communications
mode
RS-232C
4-wire 1:1
4-wire 1:N
2-wire 1:1
2-wire 1:N
1:N Host Link
YES
YES
YES
NO
NO
Non-procedure
YES
YES
YES
NO
NO
1:1 link
YES
YES
NO
NO
NO
1:1 NT Link
YES
YES
NO
NO
NO
1:N NT Link
NO
YES
YES
YES
YES
Protocol macros
YES
YES
YES
YES
YES
Connector Pin Assignment
Functions
Section 1-1
