USER MANUAL FOR HARDWARE REV 1.0
06-JUN-2019
PAGE 7
3.2.4
CTCSS ACTIVE HIGH/LOW
This switch is used to select the active on state for the CTCSS signal from the receiver radio. Typically,
this will be active low, but some radios output an active high signal. This input can be used for 3-18Vdc
signal levels.
While the board supports this signal, the SVXlink software does not support GPIO based CTCSS
detection yet. There are some tricks that can be done to make it work, but we recommend to just let
your receive radio handle this part of the detection.
3.2.5
PORT CONNECTOR & PIN 1
The duplex port comes out to a 2x5 male header. This header
is typically connected 1:1 into a DB9 Female connector, but
the user may also make a custom cable/adaptor for their own
equipment if desired.
Connector Selection: Due to the tight spacing of the board,
it is important to select mating connectors that do not exceed
the width of the male pin alignment blocks, or you risk
mechanical interference with the port 2 header. For custom
cables we suggest using connector block
, or a similar variant.
STANDARD IDC RIBBON
CABLE CONNECTORS WILL NOT FIT.
Pre-crimped cables
are also available from the accessories page of our website.
Pin 1 is located in the bottom left corner as shown above in
section 3.1. When using ICS-CTRL provided DB9 connectors,
will correspond with the brown wire.
CONNECTOR PINOUT:
1-
CTCSS ENCODE OUTPUT
2-
CTCSS INPUT FROM RX
RADIO
3-
PUSH TO TALK (OPEN
COLLECTOR)
4-
AUDIO OUTPUT
5-
AUDIO INPUT
6-
GROUND
7-
COS INPUT FROM RX RADIO
8-
GROUND
9-
GROUND
10-
GROUND (DB9 SHELL)
