Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
A practical minimum interface is TD, RD, SG and DTR, DSR.
DTR and DSR allows stuff to be port powered. RS-232 has been so screwed up from the original specification, so you never knew which was was up.
A way to look at the spec is:
DSR/DTR basically says the device has power
CTS/RTS is basically for hardware handshaking. RTS - can also be looked at as "answer the phone" and CTS - Phone has been answered
RI - the phone is ringing
SG - Signal ground
PG - Protective ground
The RTS/CTS and DSR/DTR functions were not implemented correctly in many devices.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.