Specifications
SB-P-06-4066
sepura
Mobile & Gateway Accessory i/f
specification
30th July 2012
Page 21 of 39
Issue 7c
© Sepura plc 2011
Pin
Number
SRM Signal
Name
Input/
Output
SRM2
Description
Performance
(see also note 10)
Screen
Screen
Notes:
1. The Transceiver will power up if the on/off key (PWR_ON) is held ‗on‘ on the Transceiver
regardless of the state of the ignition (IGN_SENSE) signal.
2. The Transceiver hardware will power up if the ignition line (IGN_SENSE) goes high at
the same time that the power input goes high and the power input is >10V. The power
input must rise at a rate of >100V/s for the product to power up.
3. The Transceiver hardware will power up if the power input is present and >10V and the
ignition line (IGN_SENSE) goes high.
4. The mechanism to switch the transceiver off from the console uses a message sent over
the console interface.
5. The Transceiver software is able to turn the Transceiver off even if the ignition
(IGN_SENSE) is high.
6. A Transceiver software parameter 3679 – Inactivity Timer - can be configured so that the
Transceiver will switch off immediately the ignition (IGN_SENSE) goes low or after a
defined period of inactivity.
7. Neither of the power up signals; PWR_ON and IGN_SENSE, maintains the Transceiver
power on (i.e. they are non-latching). The Transceivers own software is responsible for
holding the Transceiver internal power supply on.
8. It is NOT possible to disable the ability of Console Mode button to power the radio ON or
OFF
9. Reverse polarity protection is provided. When reverse polarity connected a diode allows
in excess of 10A to flow through it, this will cause the external fuse to break and cut off
the battery power without damaging the radio.
10. There is a pull-down resistance on each digital input. The resistance to ground, will vary
in the range 10k to 27k ohms depending on the applied input voltage, this because there
is a resistor divider network feeding a transistor junction
SPEAKER CONFIGURATIONS
Typically only one 4ohm 8w speaker is connected to the
transceiver
However the speaker driver is rated to support two parallel
4ohm speakers in a balanced 2 ohm configuration as shown
below.
No dual speaker adapter cable is currently available from
Sepura, it is expected that the installer will manufacture an
appropriate splitter cable
5V supply