Equipment Description
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Publication S177E V2.0 Issue 03/05
2 EQUIPMENT
DESCRIPTION
The master station is an assembly of a computer card, a current loop interface card, a power supply
card, and a front panel with an LCD screen and 16-key keyboard, fitted to a standard 19-inch rack.
The rack will contain some or all of the items identified in Fig. 1.
PS100
CPU and Display Module (two off in Hot Standby systems)
PS210
Power Supply module (unless the hardware is supplied by 24V dc)
PS300
Switch module for Hot Standby systems only
PS410
RS485 Converter (optional)
PS601/2/3/4 Ethernet port converter
The rack can accommodate two master stations, when viewed from the front these are referred to as
M/S A on the left and M/S B on the right. The 19-inch rack is always fully wired to accommodate all
variations of assembly within it. Some applications may require external links on the connectors and
terminal blocks and these will normally be fitted before despatch. It is advisable to check that any links
that may be required for a particular application are in place. When PS601 or PS602 Ethernet servers
are fitted there will be links to the Port 1 or Port 2 connectors and these will not be available for host
connections.
All master stations have their own dedicated power packs, each operating from an independent input.
In the case of a dual or hot standby system there maybe two independent supplies to the rack.
Optional additional cards may be fitted to the master station rack for converting the communications
hardware between RS232 and RS485, and in the case of a Hot Standby a switch unit is also included.
If the master station includes Ethernet connectivity then there are internal servers fitted inside the
rack. Where no cards are fitted blanking plates are used to cover the resulting space.
Two master stations may optionally be interconnected to form a dual redundant system. In this
configuration, one unit controls the loop, whilst the other acts as a 'hot standby'. Changeover between
the units can be automatic or manually triggered.
MASTER STATION A
MASTER STATION B
PS210 - Power Supply
PS100 - CPU & Display Module
PS410 - RS232/RS485 Converter
PS300 - Keyswitch
PS60X - Ethernet Server (Internal)
Fig 1: Pakscan IIE Master Stations in a 19 inch rack
