On Wed, 2007-08-15 at 14:30 -0400, Madison Kelly wrote: > Andrew Grimberg wrote: > > Greetings folks, > > > > Am I just blind or can I not find what type of null modem cable that I > > need for heartbeat? I've got several full-handshake cables that while I > > can communicate in one direction, aren't working in the opposite > > direction. Anybody got a suggestion as to what type of null modem cable > > I should be using? > > > > -Andy- > > Here are my notes: > > P: Error: > heartbeat[2830]: 2007/06/26_13:27:06 WARN: glib: TTY write timeout > on [/dev/ttyS0] (no connection or bad cable? [see documentation]) > heartbeat[2830]: 2007/06/26_13:27:06 info: glib: See > http://linux-ha.org/FAQ#TTYtimeout for details > Prints repeatedly in the ha.log file even when both nodes are up. You > can manually send data over the null modem cable. > NOTE: Seeing this error once when one node is down is normal! > S: As per the referenced URL; The null modem cable you are using most > likely does NOT have the CTS and RTS lines connected (pins 7<->8). > You will need to verify this using a continuity tester. The needed > cable pinouts are: > CD - 1 ---------\ /--------- 1 - Carrier Detect > RD/RX - 2 ---------|----\/----|--------- 2 - Receive Data > TD/TX - 3 ---------|----/\----|--------- 3 - Transmit Data > +----------|--------- 4 - Data Terminal Ready > DTR - 4 ---------|----------+ > CG - 5 ---------|----------|--------- 5 - Common Ground > DSR - 6 ---------/ \--------- 6 - Data Set Ready > RTS - 7 --------------\/-------------- 7 - Request To Send > CTS - 8 --------------/\-------------- 8 - Clear To Send > RI - 9 -] [- 9 - Ring Indicator (not > used/no connection) > In case my ASCII art confuses you, tie pins 1 and 6 together and run > them to pin 4 on the other side of each. So I could have drawn the above > diagram like this (Same thing just expressed differently): > CD - 1 -\ > DSR - 6 --+--------------------------- 4 - DTR > RD/RX - 2 ------------------------------ 3 - TD/TX > TD/TX - 3 ------------------------------ 2 - RD/RX > DTR - 4 ---------------------------+-- 6 - DSR > \- 1 - CD > CG - 5 ------------------------------ 5 - CG > RTS - 7 ------------------------------ 8 - CTS > CTS - 8 ------------------------------ 7 - RTS > RI - 9 -] [- 9 - RI (not used/no > connection) > Lastly, there is no wiring colour code. If you are making your own > cables, make your own colour code too! > > HTH!
Turns out I've got a bad cable. I could send in one direction, but not the other. All my own fault. -Andy-
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