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Using a Radio Handset – DTMF Model
Using a DTMF compatible Two-way Radio it is possible to make or receive a call over the
satellite network on the Radio device. To make a call from a Radio handset a PIN is
required. This is configurable to protect against unauthorised calling.
Making a call
1. Ensure that the Autodial switch on the RST820 terminal is turned OFF (pin 15
connected to GND) as it is not possible to override this autodial active mode.
This function is enabled from the Dial input of the Remote Status Indicator port
and is either an external switch or a hard-wired link to ground in the connector.
2. Ensure the radio handset is on the same frequency as the main radio unit.
3. Ensure the Satellite & Radio units are both powered ON
4. Whilst pressing the transmit button of the radio enter the PIN (default 9876) to
access the system.
a. If PIN accepted a couple of acceptance pips are issued to indicate it is now ok
to dial the phone number.
b. If the PIN number fails the handheld user receives a rising crescendo tone.
c. The access (after the PIN has been entered) times out after approx 10
seconds, after which the PIN would need to be to be re-entered.
d. In the event you have trouble entering the correct PIN wait 20 seconds in
between tries to allow the unit to reset.
e. Remember that it is not possible to transmit DTMF tones whilst another party
is transmitting on another radio in the group.
5. Once the acceptance pips are heard depress the transmit button and enter the
full number you wish to call, and then release the button.
a. Usually the transmit button of the radio needs to be pressed the entire time
the number is being entered In order to transmit the tones to the base unit.
b. If the dialled number seems to be a valid format acceptance pips will be
transmitted to the handheld from the satellite base.
c. If the number is invalid then a FAIL tone is sent; a long, low, beep.
6. Progress calling tones will be heard whilst the call connects, if the number was
incorrect or the satellite network is not available a busy tone will be heard
through the radio network.
7. Hanging up the call: If the call was manually dialled or was incoming, it can be
hung-up by the handheld user by simply pressing the transmit button of the
radio followed with a DTMF- 0 (zero). NOTE: You cannot use the radio handset
to hang-up a call that was initiated or answered on the Intelligent Handset.
Page 15 of 31
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