TTY-Connect provides everything needed for connecting most teletype machines in up to three
local current loops, and for connecting a computer (PC) and/or a radio terminal-unit (TU) via
RS-232 serial ports. Power is provided for the TTY loops (and current-limiting), as well as
full opto-isolation. Note: this unit is NOT designed to connect to externally-powered loops.
You can simply use the unit as a loop supply for connecting multiple TTYs on a loop. Or, you
can manually patch a loop to a computer's 232-serial (com) port, allowing a program on the computer
to talk to the tty gear. Or, you can manually patch a loop to a radio terminal-unit's 232-serial port,
and have the tty gear print the received rtty broadcast. Or, you can include the optional
microcontroller to provide programmable signal connections between the loops/TU/PC, data-regeneration,
and customizable features like Auto-CR-LF-Insertion, Autostart (motor powering), Selective-Calling,
Who-Are-You (WRU), Ascii/Baudot-Conversion, Speed-Conversion, etc.
Note: This is not an entry-level project. You must procure the parts, assemble the circuit board,
prep and wire a chassis, test high-voltage circuitry, and load firmware into a microcontroller.
TTY-Connect has nasty lethal voltages inside -- please be extra careful.
No warranties expressed or implied.
Questions? Contact me at:
Last updated: Jul 8, 2005 (format-only)