8A089X01 Rev 1
SLIM Installation Manual
3/23/2018
Page 25 of 61
2.5.1.2.2 Identifying Outputs
The top right pane of the screen shows the siren control head selected from the Modify
Devices screen. The control head represents buttons or functions which can be set as
outputs from the Module. Carefully review the image and compare it to the equipment
used in the vehicle to understand the button labeling.
Figure 2-22 Output/Button Identification
The GPIO pins are located on the physical GPIO port of the Module. There are four
dedicated inputs and four dedicated outputs. The outputs provide a path to ground for low
current devices when the output is activated. For electrical information refer to Section
3.4.5: “General Purpose Inputs & Outputs (GPIO)”.
There is one additional output which is not represented visually
– Public Address (PA).
The Module is capable of taking audio from the radio microphone and outputting it to the
light & siren controller for amplification and output to a siren speaker. The radio and
Module do not output PA audio by default. PA audio is an additional output which can be
enabled by the Module.
2.5.1.2.3 Identifying Input And Output Connections
The most important part of configuring the Module is deciding how it should be configured.
This depends on the wants and needs of the user as well as the limitations of the
equipment used. Both the radio and the siren & light controller should already have been
programmed in preparation for use with the Module. Time should be spent to carefully
plan out the desired connections between the inputs and outputs.
The module works by virtually mapping input buttons to output buttons. This allows, for
example, a radio control head button to be used to simulate pressing a siren control head
button. When fully integrated, the radio control head would then be able to control a siren
feature which was previously only available on the siren’s OEM control head.
