Crown Broadcast FME 350W to 2000W User Manual– 05/2013
Page 88
Crown Broadcast, a division of International Radio & Electronics Corporation 25166 Leer Drive, Elkhart, Indiana, 46514-5425 USA
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8. REMOTE CONTROL AND MONITORING WITH THE GPIO BOARD
8.1. Introduction
This function is available when the optional standard or analog GPIO board is installed on the transmitter.
It provides an interface between CROWN BROADCAST transmitters and external systems. The modules are
remotely controlled via “RC” inputs using opto isolators. Working state and alarms are sent to “RM” outputs
via relays, or “RM ANA” analog outputs on the analog board.
8.2.
Standard GPIO board
8.2.1. Description of control and monitoring functions
Control commands work when an impulsion longer than 100 ms is sent to the corresponding input.
There are eight control functions:
Standby off: Turns on the transmitter
Standby on: Turns off the transmitter
RF on: Enables the RF
RF off: Disables the RF
TA on: Enables the TA (basic RDS)
TA off: Disables the TA (basic RDS)
DSN main: Enables the main DSN (basic RDS)
DSN alt: Enables the alternative DSN (basic RDS)
Outputs are relays that include a normally closed or normally open contact. When an event occurs in the
unit, the corresponding relay is activated.
Six monitoring functions are associated with relays:
Local: Indicates if the unit is in local mode
Default: Indicates a transmitter default
Warning: Indicates an alarm linked to the internal working of the transmitter (temperature, voltage…)
RF: Indicates if the RF is enabled
On: Indicates if the transmitter is not in standby mode
Off: Indicates if the transmitter is in standby mode
VSWR: Indicates if there is a VSWR error
