ABB SC300E Serial Communications Module
INTRODUCTION AND TECHNICAL DATA
PURPOSE
The Serial Communications Module provides a serial interface between the SC300E
environment and a variety of remote devices complying with the standard RS232-C. At least
one Serial Communications Module must be used in the system and fitted in Slot 10 of the
main chassis to enable communications between the system processors and the
workstations. The workstation link is used for loading the application software and monitoring
ladder and diagnostic functions. The link utilises Port 0 of the module. Additional modules can
be fitted to any other I/O slot, ‘wrong slotting’ is prevented by mechanical coding blocks (Figure
2-1 ). The system software identifies the module via a built-in hardware identifier.
Circuit triplication and voting procedures make the module single fault tolerant and front panel
indicators show Tx/Rx activity, the circuit on-line status and the health of the module.
Communications connections are via four identical ports on the front panel (Ports 0 to 3) and
these connections are duplicated on the field connector (J2) at the rear. A fifth port is for
diagnostic purposes only. The module is compatible with ‘single slot hot repair’ and the front
panel has a switch to enable a request that the module be taken off line.
This document is intended to provide a general understanding of the function of Serial
Communications Module, sufficient to enable basic maintenance operations to be effected inthe field.

ASSOCIATED DOCUMENTATION
Reference No Title
008-5097 Chassis User Manual
SPECIFICATION
Model MSR04XI
Communications Serial RS232
Mictrocontroller Intel family
Communication ports: Port 0: RS232 9600 or 19200 Baud
Port 1: RS232 9600 or 19200 Baud
Port 2: RS232 9600 or 19200 Baud (see Note)
Port 3: RS232 9600 or 19200 Baud (see Note)
Diagnostic: for diagnostics purposes only Note:
Ports 2 & 3 must be set to the same Baudrate.
rate. Isolation Ports 0 to 3, 1kV
Indicators Tx, Rx, Health, 3 x On Line
Hot repair procedure Single slot
Module power consumption 3.5W
Overall size (mm)
Overall size (inches)
400(9U)H x 397L x 28W
15.75H x 15.63L x 1.1W
Weight 1.3kg
Triguard SC300E
ENVIRONMENTAL SPECIFICATIONS
The maximum ambient temperature measured at the hottest point within the Triguard system
shall not be greater than 60 degrees centigrade.
Temperature operating: +5°C to +60°C
Temperature storage: -25°C to +70°C
Humidity 5% to 95% non-condensing at ambient <40°C
EMC/RFI Immunity Tested and certified to IEC 1131-Part 2 1994
Vibration/Shock Tested and certified to IEC 1131-Part 2 1994
Certification:
General Certification: Ref. SC300E Product Guide (ref 008-5209)
TRANSPORT AND HANDLING
The MSR04XI module must be transported and stored in its original packing material which
should be retained for this purpose.
TECHNICAL DESCRIPTION
PHYSICAL
The Serial Communications Module is a 9U high PCB with integral front panel and front and
rear connectors; a plug-in daughter board carries the RS232 interface circuits. Figure 1-1
shows the general layout, location of the connectors and front panel components.
Mechanical coding blocks
All Input/Output modules carry two mechanical coding blocks equipped with pins which mate
with holes in corresponding blocks in the chassis and prevent the module being inserted into
the wrong slot. The pins in the module blocks are factory installed in a pattern determined by
the module and corresponding set screws are removed from the chassis coding blocks to
enable fitting. Unused holes are plugged with set screws. The chassis mechanical coding
block configuration for this module is shown in Figure 2-1