Partyline: What is the TW-20 interface?
Question: I purchased a Clear-Com TW-20 interface from a rental house, it appears to be a version of the TW-40 2-way radio interface. Can I get a user manual for this product or at least the pin outs so I can interface it to a 2-way radio?
Answer: Unfortunately there aren't any electronic copies of the user manual or data sheets for this obsolete product. The good news however is that the pin outs for this product are exactly the same for the DB-9 and XLR pinouts as the TW-40 2-way radio interface. The only difference with the TW-20 is that it was not capable of interfacing to RTS 2-wire PL intercom.
Link to the TW-40 manual http://www.clearcom.com/userfiles/file/User%20Manuals/Discontinued%20Products/Partyline/Clear-Com_TW-40_Manual.pdf
Note: both the TW-20 and TW-40 are obsolete and replaced by the TW-47 unit TW-47 manual http://www.clearcom.com/userfiles/file/User%20Manuals/Partyline/Clear-Com_TW-47_Manual.pdf