Geez, sorry to waste your time with a reply, Jim. Do you already know how to use Google?http://ohnosec.org/drupal/node/17773,KyleK0KN--- Original Message --- I already know how to build a simple transistor switch.... How do you set up Asterisk to use the parallel port? What commands where? 73 Jim W7RY On 2/8/2014 1:34 PM, K&R Yoksh wrote:
Hello Andrew,
In case George doesn't have anything written up for parallel port operation: http://www.qsl.net/k0kn/plri.html
There are several circuits detailed here, from the simplest discrete transistor type, to a transistor IC type that can support multiple radios.
You can also use an off-the-shelf IRLP board, should you have one laying around. The DTMF decoder is not supported by Asterisk (Asterisk uses DSP techniques to decode DTMF), so I dropped the MT8870 from my schematics.
At it's simplest, all you'd really need is one NPN transistor for PTT (active high from parallel port, active low to activate PTT), and one PNP transistor for COS (if active high from radio). If your radio uses active low COS, I'd buffer with two transistors (PNP to NPN), rather than directly connecting the radio to the PC.
I'd suggest using active low at the parallel port inputs.
73 and good luck.
Kyle K0KN Allstar 2210-2219
--- Original Message ---
Hello George,
Do you have it documented anywhere how you configure the parallel port for COR and PTT? I'd love to see how you have it configured?
Thanks!
On Saturday, February 8, 2014, George Csahanin <george at dyb.com> wrote:
I bought some CM108 fobs on EBAY for $0.99 each. He has a s***load of them. Not knowing if they'd be real CM108 I waited till I got them to send this note. The USB ID is 08dc:000c the real thing.
The last four nodes I built up use D945 motherboards which have parallel ports, which I use for COS/PTT and the USB fob only does audio. No need to modify them for PTT and COS, etc.
Anyhow, the EBAY auction is 300503465055 OR click this link<http://www.ebay.com/itm/300503465055?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649>
Seller's store is circle607. They're in Hong Kong. But the postage was under $1.20 for all ten.
I stocked up simply because they work so well, cost so little, and not sure when they will stop being available. (hoarding 101)
GeorgeC W2DB Allstar 2360
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