DIGITIZE System 3505 Manual de instrucciones - Página 9

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Slave #3 is located remotely in the BPD. This unit is controlled via the right or the

left main rack system. The rack feeding this slave will have a red LED activated on

the right or left main rack. There are three cable pairs running between BFD and

BPD. One cable pair is used to run Network data information, one for Code data and

a third to control a relay selecting which main rack is used to feed slave #3.

Slave #3 will hunt between the left and right main rack until it finds a good code data

line. Once a signal if found, slave #3 will remain on that side until manually

requested to switch, or a failure is detected on the code data line.

Both the Network and code data lines are buffered from the data lines used within the

BFD dispatch center. Thus a problem with these lines will not effect the dispatch

center operation.

Supervision of slave #3 is via the Left or Right rack, depending on which rack is

controlling this slave unit. Any error messages relating to slave #3 will be displayed

on the left or right system only (not both). When slave #3 switches, the rack no

longer feeding this unit will restore any error message associated with this unit. The

new left or right unit now controlling slave #3 will now take over and display any

error messages.

Automation Link

Each of the main racks is set up to send data to the computer for the purpose of data

logging. Each main rack supervises its link to the automation system. The data is

logged only once, although sent by booth racks. If either the right or the left side

indicates that an automation error exists, this indicates that that side (right or left) is

not communicating with the data logging system. However the data logging PC

should still be receiving and recording data. If both the right and left systems report

an automation error, then no data is being logged or recorded. Check the PC to verify

that it is still running the data logging software. An automation link down signal will

not hamper any other feature of the overall alarm monitoring, decoding or

transmission of a telegraph box.

Automation link down error message

DIGITIZE, INC. 700251 REV B 04/02

Specifications Subject to Change Without Notice