Connecting to an Emergency Alert System (EAS)
Result:
Table 2-1: GPIO/RS-422 Pin Signals and Assignments
Spectrum X pin
ChannelPort pin
Signal
Assignment
RS-422 #1: shell
1
Ground
Ground on Com 2
connector
RS-422 #1: pin 8
2
RS422_RX0_N
RS-422 #1: pin 3
3
RS422_RX0_P
RS-422 #1: pin 7
11
RS422_TX0_P
RS-422 #1: pin 2
10
RS422_TX0_N
Receive/Transmit on
Com 2 connector
GPIO: pin 4
22
GPI 3
D in 1
GPIO: pin 5
23
GPI 4
Decoder Relay
GPIO: pin 6
24
GPI 5
Relay 4
When connecting RS-422 pins from the GPIO/RS-422 connector(s), make sure the polarity matches. For
example, always connect the Rx+ signal to Tx+ and, likewise, connect the Rx- signal to Tx-.
Related information
on page 114
GPIO/RS-422 connector signal assignments
on page 181
Configuring the Sage Digital ENDEC
Use the front panel of the Sage Digital ENDEC to configure the necessary settings.
NOTE:
In a typical configuration for a Sage ENDEC, an amplifier may be required to boost
the audio output from the PC.
• Using the Sage Digital ENDEC front panel, configure the following settings.
Relay Configuration
◦ Relay 4: Delay Post CGEN, 0, End
◦ Decoder Relay: Ready
Main Configuration
Override Input (D In Use): Active Closed, Hold
Incoming Filter
In order to hold off alerts they should be associated with “Timed Relay.” This
gives the operator a period of time to cancel relaying the alert before it is
sent. In this mode, the forwarding of an alert is gated by the override input
(D In 1) which allows automation to control when an alert is inserted into
program material. The Hold Time can be set to 0 to make it immediately
relay the alert (subject to the hold-off input). “Timed Ignore” provides the
operator opportunity to manually relay the alert or else it will be ignored.
Relaying the alert is subject to the hold-off input.
◦ Timed Relay, Hold 0: Send immediately, hold-off enabled
◦ Timed Relay, Hold n: Send after n minutes, hold-off enabled
◦ Timed Ignore, Hold n: Ignore after n minutes, hold-off enabled
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Spectrum System 8.4 Installation Guide
