jim49 said:
Thanks for your help everyone. The priority system is a Motorola Type II SmartZone. I think I'll see what GRE has to say about it.
Whether it works on a given Mot system or not is pretty much up to the people who set up the system, since it's a configurable feature on the system itself (IIRC, Mot calls it "Priority Scan", or something similar). In effect, the low-speed data on a VC may or may not contain information about talkgroups other than the current talkgroup and, even if it's enabled, won't necessarily list
every other active talkgroup - only those that have been defined by the system as "priority".
For example, my local Mot system doesn't appear to use the feature at all. The low-speed data only contains the current talkgroup. I've never seen it dump any other active talkgroups.
You can see what your system includes in the low-speed data by:
1. PGM FUNC GLOB, scroll to end, enable "CCDump" feature
2. Connect USB programming cable to PC and scanner
3. On the PC, run a terminal program (e.g. Hyperterm), setting it to 115200 bps, 8 data bits, no parity, 1 stop bit
4. When a voice call on the system is active, look at what is dumped to the terminal program
The low-speed dump to the terminal program should contain lines of the form:
M36:Txxxx:tm:yyyyy:Sa:zzz
<xxxx> is the object ID of the TSYS
<yyyyy> seems to be a time stamp
<zzz> is a talk group ID, divided by 16. For example, TGID 112 would be listed as Sa:007
If you only see <zzz> values that correspond to the TGID that's on the current VC, even though other TGIDs are active on the system, then your Mot system may not support the feature, or those other active TGIDs haven't been configured as "priority" in the system, so they don't appear in the low-speed data.