Motorola GM1200E Service Manual download pdf (Page 62)

Other Calls

B-2 NPD Application Notes

3.2 Calls Initiated by another Radio Unit (Incoming Calls)

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Incoming calls will be indicated by a signal on the CTS.

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The call will be “answered” by the DTE signalling on ‘Call 3’ (i.e.Call 1 and Call 2 lines both

enabled).

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The call will continue and clear as described above in section 3.1

4.0 Other Calls

4.1 Voice Calls

It is possible to set up voice calls internally or externally using the procedures described above by

omitting the NPD call modiﬁer from the called address. In this case the audio paths will be set up to

use the external microphone and loudspeaker with the volume pre-set. It is not possible to adjust the

volume from inside the radio.

4.2 Status Calls

It is possible to signal status calls internally or externally.

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Status is sent by signalling on ‘Call N’ to a pre-set address using the Status call modiﬁer.

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The radio will send the pre-set status call to the pre-programmed address.

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Call “success” will be signalled with a pulse on the CTS line.

4.3 Mixed Calls

Due to the ambiguity necessarily introduced by the very simple handshaking techniques employed,

users should only consider mixing Data/Voice/Status calls if they are conﬁdent that their DTE is

capable of correctly interpreting the handshakes under all conditions for all incoming and outgoing

call types likely to be encountered.

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Motorola GM1200E Service Manual Page 62