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4/2 4/1 Timing Protocol Spefications wanted (Alarm protocols)

Subject: 4/2 4/1 Timing Protocol Spefications wanted (Alarm protocols)
From: Bager2700 <bager2700@xxxxxxxxx>
Date: Tue, 28 Dec 2021 13:25:51 -0800 (PST)
Newsgroups: alt.security.alarms

Hey I know 4/2 protocol is older than the days, however I am looking for the specs for the timing of the protocol.

AKA  from Dialer going on line to waiting for station receiver online panel data tone bursts --- ACK -- kissoff etc.

Although the timing is fairly flexible  i would like to know the actual specs for the sequence and timing.

I have the SIA, Contact ID, FSK, etc but 4/2 formats i have not found information.
Does anyone have the info?
Thanks inadvance

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