Specifications

41
Schneider Electric
20 mA CL – RS232 – RS422 –
RS485 links
Architectures
(Connection on SubD9 recommended, maximum length 3000 m at 1200 Bds, and
300 m at 9600 Bds, bus topology.)
(Connection on a SubD9 or 25 pts, maximum length 15 m at 19200 Bds.)
(Connection on SubD9 recommended, maximum length 1200 m at 19200 Bds.)
(Connection on SubD9 recommended, maximum length 1200 m at 19200 Bds, bus
topology.)
Definition: A 20mA current loop is a multi-point link
(the number of points depends on the types of
transmitters/receivers) via a 4-wire cable.
Definition: An RS232 link is a point-to-point link via a
cable with at least three wires.
Definition: An RS422 link is a point-to-point link via a
cable with at least four wires for full duplex operation.
Definition: An RS485 link is a multi-point link (32
points maximum) via a cable with at least 2 wires for
half-duplex operation.
Topologies
E52323
Bus
E52324
Ring
E52325
Star
E52437
Point-to-Point
Guide to Integration
Modbus / Jbus