RTK Series 725 Annunciator
87
29. P725 To P725 Serial Links
Local And Remote Systems Linked Via Communications
In applications that require local panel alarms to be duplicated or summarised in a central control
room each P725 can be supplied with a serial interface card which allows RS485 communication
between units using Modbus protocol.
As an example a local annunciator can be hard wired to the alarm contacts and the alarm information
can be transmitted over the RS485 communications link to a slave P725 unit mounted in a control
room or monitoring station.
RS485 LINK BETWEEN
P725 ANNUNCIATORS
SLAVEMASTER
Each Serial Communication card is equipped with a watchdog relay and this relay will change state if
any errors in the internal or external communication are detected.
In larger applications multiple P725 Annunciators can be connected to a single P725 Annunciator
used for central monitoring. Each annunciator in the scheme will require the optional serial interface
card.
The key advantage with units configured in this manner is the central monitoring annunciator only
requires 24VDC logic power and a 4 core RS485 cable to function.
In this example functions F16 and F17 are used to configure each unit to either transmit or receive
serial data as required.
Please note:- one of the devices must be set as a master.
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