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Charnwood Dynamics Ltd. Coda cx1 User Guide – Coda Basics I - 1

CX1 USER GUIDE - COMPLETE.doc 26/04/04

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Computer Specification – Active Hub Operation

When the Coda scanner is operated with an active hub unit, the host system controller

forms part of the active hub and must be a compact PCI (cPCI) Single Board Computer

(SBC) running Microsoft Windows 2000 or XP. A single slot 3U SBC is recommended

with a processor speed of at least 500MHz.

The SBC connects directly into a 3U cPCI backplane together with a Charnwood

Dynamics Quad UART board. A single Quad UART board can provide up to four RS-422

interfaces to support up to four Coda cx1 scanner units at speeds of up to 5M-baud.

Special drivers (supplied) must be installed to use these RS-422 interfaces which appear

as standard COM ports – usually COM 3, COM 4, etc.

Mini Hub Unit

The mini hub unit is used to provide the 12V DC power and high speed serial

communications link to the Coda scanner unit via the Coda interface cable and then to the

host computer using a serial cable.

Each mini hub bulk head is fitted with two 26-way high density D sockets for connection of

the Coda interface cable(s), two 9-way D sockets for RS-422 serial communication and

two 9-way D sockets for RS-232 serial communication. There are two Coda unit power

on/off switches and associated LED indicator lights. The red LEDs signify that there is

mains power to the mini hub while the green LEDs show power to the Coda scanner

unit(s) is on (the green LEDs are only activated when there is a Coda unit plugged in).

Two sync. sockets are also provided for connection of an additional mini hub unit or for

external sync. triggering.

A single mini hub can support up to two Coda cx1 scanner units on either RS-232 or RS-

422. When two Coda units are connected to a single mini hub, they are automatically

synchronized (no additional sync. cable is required - the sync. lines are connected inside

the mini hub). When two mini hubs are used to operate three or four Coda cx1 units, the

sync. Out on the first mini hub must be connected to the sync. In on the second mini hub.

Two Coda cx1 units connected to the same mini hub can be operated independently from

different host PCs if required.

Active Hub Unit

The active hub unit can be configured to meet specific customer requirements but is

based around a Single Board Computer (SBC) and Charnwood Dynamics Quad UART

board on a 3U cPCI platform. The active hub provides the 12V DC power and high speed

serial communications link to the Coda scanner unit(s) aswell as enabling overall system

control through the SBC.

Each active hub unit consists of a 4/6 or 8-slot 3U cPCI backplane housed in a full (19

inch) or half rack. Power to the backplane is provided from a front panel mounted power

supply and/or from a power supply fixed inside the rack.

The cPCI backplanes used by Charnwood Dynamics normally have a left hand system

slot. Unless otherwise stated, the SBC must occupy the first slot on the backplane

(reading from the left hand side).

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