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ABB Serial Communications Module RS232

From:ABB | Author:Wang | Time :2025-01-07 | 235 visit: | Share:

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 in

the field.

Triguard SC300E

Ejector lever

User COMMports

Diagnosticport

Mechanical coding block

(Upper)

Connector J1

(Module ID)

Link LK2

(Voltage Mon)

Link LK2 Link LK4

Tx / Rx LEDs

Health LED

ON/OFF LEDs

ON/OFF Line

Request switch

Ejector lever

Connector J2

RS232 Daughterboard

Mechanical coding block

(Lower)

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 Baud

rate.

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 .

Triguard SC300E

On the lower section of the PCB are three further links, LK2, LK3 and LK4, located and

configured as follows:

LK2 (2-pin) located approximately 220mm down from the top of the module and 110mm in from

the front face, used in the voltage monitoring circuit, always fitted.

LK3 (3-pin) located beneath the plug in daughterboard. Used for 3-2-1-or 3-2-0 operation,

factory fitted hard wired, all pins linked for 3-2-1 mode.

LK4 (3-pin) located approximately 250mm down from the top of the module and 220mm from

the front face, used for the daughterboard clock speed setting, pins 1 and 2 linked.

Table 2-1. Default link settings

Link Default setting

LK1 (3 off x 3 pin) Links not fitted

LK2 (3 off x 8 pin) Fitted

LK2 (2 pin) Fitted

LK3 (3 pin) Hard wired (all pins linked)

LK4 (3 pin) Fitted (pins 1 & 2 linked

EXTERNAL CONNECTIONS

Pinouts and signals for front panel connectors J4 to J6 through to J2 backplane are given in

Table 2-2.

Is your interface DTE (data terminal equipment) or DCE (data communications equipment)?:

The point of reference for all signals is the terminal (or PC).

Transmit and receive leads (2 or 3) can be reversed depending on the use of the equipment,

either DTE or DCE.

THEORY OF OPERATION

Triplicated data enters and leaves the module (Figure 2-3 ) via the chassis backplane

connector J1 and is isolated from the MPP by bus transceivers. Data for transmission is

loaded into dual port RAM in each of the three circuit branches and is voted 2-oo-3 before being

passed to the USARTs on the daughter board where it is serialised and sent to the appropriate

communications port.

Data received at the ports is converted to parallel form by the USART and written to dual port

RAM in each branch, the data is accompanied by information about the status of the ports and

the embedded microprocessor. The dual port memory is then read by the MPP via a second

set of transceivers.

The four communications ports are configured to run in full duplex mode using an RS232

interface and having a maximum rate of 19200 Baud. The communications ports are isolated

from the module circuits by opto-isolators and connected to field connector J2 at the rear of the

module. The ports are capable of powering modems or line drivers for transmission over long

distances.

Power for the module circuits is derived from the dual redundant SC300E power supply units,

individual auctioneering and regulating circuits supplying various logic areas. The

communications port opto-isolators and interfaces also have separate supplies.

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