Connecting to an Emergency Alert System (EAS)
Figure 2-40: Detailed view of sample installation with TFT EAS 911T
2. The following table explains the pin signals and assignments used in the detailed view of the TFT
EAS 911T installation. Use the following table for reference when connecting to the EAS.
Result:
Table 2-2: 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
On-Air
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 TFT EAS 911T
Use the front panel of the TFT EAS 911T to configure the necessary settings.
For a typical configuration, set the following:
73
Spectrum System 8.4 Installation Guide
