STC Smartscan NG2, Руководство пользователя

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EUD-2018086-00 Rev.3, SmartScanNG² User's Guide for Wayside Enclosure Components, 14 May 2021
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2.2.8 External Radio Connector
The external radio connector is a DB15 connector. Located on the System-Interconnect board
is an 8-position channel selector switch, which controls pins 1-3 in a binary fashion. Pin-5 and
pin-1 are the same electrical connection, which also connects to a digital output from the
Processor board. When channel zero is selected with the channel selector switch, the
processor can select either channel-0 or channel-1. Software that supports processor-
controlled channel selection is optional.
Pin-5 connects to a digital output from the Processor board. When channel zero is selected
with the channel selector switch, the processor can select either channel-0 or channel-1.
Software that supports processor-controlled channel selection is optional.
Pin-6 provides regulated 11.5 volts at 2.5 amps which is appropriate for the Ritron radio but
not for larger radios requiring more power . It is advisable to use another means to power
such radios.
Pin-7 provides audio output from the SmartScanNG² system to an external radio. The audio
level is adjustable using potentiometer R34 of the SICM board (see page-4).
Pin-8 provides a ground return for 12V OUT.
Pin-12 provides audio input to the SmartScanNG² system (from the external radio) when the
rebroadcast function is used.
Pin-13 is the carrier-detect input to the SmartScanNG² system. This signal is internally pulled
high. A low level prevents the SmartScanNG² system from initiating a voice transmission.
Pin-14 is the PTT output from the SmartScanNG² system. It is an open-collector, active low
signal, which is grounded while the SmartScanNG² system is transmitting.
Pin-15 should connect to the audio ground and radio ground of the external radio.
Pin-4 , Pin-9 , Pin-10 , and Pin-11 aren't used.
EXTERNAL RADIO CONNECTOR - NG²
PIN # Name Description
1 CS0 Channel Select low bit
2 CS1 Channel Select mid bit
3 CS2 Channel Select high bit
4 unused - - -
5 CSN Channel 1 / 2
6 12V OUT 11.5V @ 2.5A
7 AUD OUT Audio Output
8 BATT GND GND RTN for 12V OUT
9 PGN IN/OUT Programming I/O
10 unused - - -
11 unused - - -
12 AUDIO IN Audio Input
13 DCD Carrier Detect
14 PTT Push-to-Talk
15 AUD GND GND RTN for AUD, PTT, & DCD