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Using a TI Silent 700 707 terminal with direct serial connection?

compu_85

compu_85

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Jun 27, 2006
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Has anyone here ever used a TI Silent 707 terminal with a direct serial connection? The unit has a built in 300 baud modem, and an acoustical coupler port. Looking at the board I don't think the coupler port is RS232.

I'd like to get this device hooked up without having to put a modem in the middle - though that wouldn't be the end of the world.

Here's a photo of the board: https://goo.gl/photos/nXcVd5ap6z6wG4B38

The connection for the acoustic coupler is J3, to the right of the phone jacks.

Thanks,

-J
 
The only connections on the back are the 2 phone modular jacks, and the 6 pin acoustical coupler port.

-J
 
Probably TTL, but you might check the maintenance manuals for related S700 models to see if there's a pattern. (The mainenance manuals are on bitsavers and include schematics).
 
Chuck,
I can't see maintenance manuals for the 707. The MANX site says "no copies on-line". The 707 is rather oddball and much smaller than the usual models. I have a 703 and a 747 and they are very different in construction.

http://vt100.net/manx/details/2,17443

Looking at the user manual I suspect that the acoustic coupler uses the modem chips in the main unit and just feeds audio and perhaps power to some "trasnducers" i.e. a microphone and speaker...
Dave
 
Why not just try to find a serial 707. I have one and find it really useful because of the size. Wish I had the 1200 baud version but even at a fixed 300 it's useful. They did drop the current loop that the larger old ones had in addition to losing the 110 baud, so it won't be good to hook up to some machines.
 
I suppose I could keep looking for a cheap serial version. I did just find a cheap ($35) compact 8 extension PBX, so I could also use it through dial up for the time being.

Thanks,

-J
 
The manual for the 703/707 models can be found here: http://www.bitsavers.org/pdf/ti/ter...7_Data_Terminals_Maintenance_Manual_Feb84.pdf

According to the 707 schematic (page 88 of the manual linked above), the difference to the 703 (schematic on page 82 of the manual linked above) is the connectivity to the TMS7041 chip. The 703 uses 75188/75189 line drivers to connect the RX/TX lines of the TMS7041 (pins 16 and 37) to the DB25 connector while the 707 connects the same RX/TX lines to the acoustic coupler port via a TMS99532 modem chip. Thus, it should be possible to add RS232 connectivity to a model 703 by disconnecting the RX/TX connections from the modem chip and connecting them to line drivers instead.
 
An old post but timely. I just found a 707 and am thinking for quick connection a driver pc board.
 
I've got a 709 which is the European version and does away with the modular jacks in favour of a D-sub.
I reverse engineered the pinout but I'll be buggered if I can find my notes on it. Thankfully I posted it on fedi: https://mastodon.org.uk/@philpem@digipres.club/111405104849100713

Pinout is...
P1.1 -> DB25.13 -> GND
P1.2 -> DB25.14 -> +Unreg
P1.3 -> DB25.3 -> -Unreg
P1.4 -> DB25.1 -> Acoustic Coupler RX (audio to 709)
P1.5 -> DB25.17 -> CONTAC (via 30k to +12V regulated)
P1.6 -> DB25.2 -> Acoustic Coupler TX (audio from 709)

I figured the easiest way forward would be to set up an Arduino as an RS232 interface and 300 Baud modem, but I've not gotten around to it yet. The comedy option I used for the "look it works" posts was to hook it up to my VoIP PBX using the acoustic coupler, then hook a modem up to another extension.
 
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