Installation; Serial Communication Adaptors For Personal Computers; Electrical Connections; Serial Connections - ABB COMMANDER 300 Operating Instructions Manual

3 INSTALLATION

Observe the limitations outlined in the
Operating Instructions
maximum serial data transmission line
length for both RS422 and RS485 systems is
1200m.
3.1 Serial Communication
Adaptors for Personal Computers
An RS422/485 communications adaptor
board is required for serial links. It is strongly
recommended that the card used has
galvanic isolation to protect the computer
from lightning damage
immunity from noise pick-up from cables.
The following OPTO22
recommended for use with the C300 serial
instruments.
Part No. Computer Type
AC24 XT Bus IBM PC compatible
AC24 AT AT Bus IBM PC compatible
AC34 Microchannel IBM PC.
The following'Jumper'
required on OPTO22
supplied as the default configuration):
install line termination
RX & TX
jumper
Install pull-up and pull-
down jumpers
disable jumper installed.
CTS & RTS
Select board address and interrupts as
described in the OPTO22 manual.
Computer Terminal or
Host Computer
(IM/C300). The
and increase
boards are
selections are
boards (usually
Chain of Controllers Connected
Fig. 4.2 Schematic Diagram

4 ELECTRICAL CONNECTIONS

All connections, apart from those for serial
data communication, are made as shown in
Table 4.2 in the Operating Instructions
(IM/C300).
4.1 Serial
Connections – Figs. 4.1 and 4.2
The controllers must be connected in parallel
as shown in the schematic diagram – Fig.
4.2. The RS485 standard quotes connection
of thirty two slaves (C300 Controllers)
maximum to any single driver (computer
terminal or host computer); the RS422
standard quotes connection of up to ten
slaves. However, these numbers can be
increased if the driver's serial port permits.
Make serial data connections as shown in
Fig. 4.1. The type of cable used is dependent
on the transmission speed and cable length:
Up to 6m (all speeds) – standard
screened or twisted pair cable.
Up to 300m – twin twisted pair with
overall foil screen and an integral drain
wire, e.g. Belden 9502 or equivalent
Up to 1200m – twin twisted pair with
separate foil screens and integral drain
wires for each pair, e.g. Belden 9729 or
equivalent.
Termination Resistor
(on C300's receive input)
Last C300 Controller
in Chain
3