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Unfortunately, finding the practice for the FL-2000 is going to be difficult. It didn't last long, it was very expensive and the only 1A2 customers leasing them from the LECs were ones with deep pockets, like government agencies. Sadly, we threw one of them out with packaging and docs recently.
My apologies for my clouded memory on these units, but I never actually installed them. I seem to recall that the lamp was steady when any station went off hook to dial. Once the station code was dialed, it began flashing on all phones. Upon answer, it went back to steady. This was accomplished by utilizing the button's A lead and an in-line resistor. When the unit detected the resistance of two buttons pressed, it "knew" to go steady. I may have this confused with Valcom units that definitely worked this way.
The more I think about it, the FL-2000 may have had A-lead connections from each station adjacent to each buzzer for the associated station. To explain: The output went A20, B20, A21, B21, A22, B22, etc. (or something like that). This is a situation where we need the expertise of Arthur P. Bloom. Is he still with us?
Professor Shadow, Thanks for the idea to email them, I emailed Tone Commander and they had no luck on finding a manual....
Ed, What I understand what Tone Commander is using the R leads from the intercom to make the lamp on the called station to flash (activation). Then they are using the motor start lead and the lamp flash from lead from the interrupter. Seems to be very simple installation to get it hooked up, I would have to uncommon my lamp leads.
The lamp on all the other phones remain solid.
I think about 10 years ago someone here posted about the unit. I was very very lucky to find one. I think Melco had a version of this too.
Melco's version was the KL-19A a two path intercom that controlled the lights, etc. I actually had one or two of them at one time, they were wrecked out from a customer that went with that new electronic key system.
There was a thread in archives on the Melco box and a comparison of the difference between a 19A and a 30 on the TCI site. It did take deep pockets for a lot of the intercom stuff. IIRC Tone Commander made a forerunner to the PBX in the Innkeeper and Storekeeper systems. I had one of those in my hands as late as 1988. I actually saw one on the wall at a K-Mart in the Detroit area, used as a giant intercom.