26 Aug
2005
26 Aug
'05
8:25 p.m.
Does anyone know the pinout of the V25 interface (DB25 connector)? No,
this is not a typo for V24, which I know ot be much the same as RS232.
V25 seems ot be an interfce for autodiallers.
-tony
26 Aug
26 Aug
9:58 p.m.
On Fri, 26 Aug 2005, Tony Duell wrote:
Does anyone know the pinout of the V25 interface (DB25
connector)? No,
this is not a typo for V24, which I know ot be much the same as RS232.
V25 seems ot be an interfce for autodiallers.
I just looked, and V.25 explicitly refers to the V.24 pinout. V.25 (and
V.25bis and V.25ter) only specify procedures user over the v.24 circuit in
automatic dialling scenarios (when to raise/lower which signals and a
DTE-DCE command/response format) V.25ter is the familiar AT command set.
Alexey
27 Aug
27 Aug
12:34 a.m.
On Fri, 26 Aug 2005, Tony Duell wrote:
Hmmm....
I have an instrument here (an HPIB extender) with 2 DB25's on the back.
One is marked 'RS232 V24' and is clearly a normal-ish serial port to
connect to a modem. The other is for an autodialer and is marked 'RS336
V25' (I think that's the right RS number, maybe RS339). I don't think
that's a normal serial port, but it does seem to use the same voltage
levels (in there there are what look like 1488 and 1489 chips linked to it).
-tony
Does anyone know the pinout of the V25 interface
(DB25 connector)? No,
this is not a typo for V24, which I know ot be much the same as RS232.
V25 seems ot be an interfce for autodiallers.
I just looked, and V.25 explicitly refers to the V.24 pinout. V.25 (and
V.25bis and V.25ter) only specify procedures user over the v.24 circuit in
automatic dialling scenarios (when to raise/lower which signals and a
DTE-DCE command/response format) V.25ter is the familiar AT command set.
10:53 p.m.
I just looked,
and V.25 explicitly refers to the V.24 pinout. V.25 (and
V.25bis and V.25ter) only specify procedures user over the v.24 circuit in
automatic dialling scenarios (when to raise/lower which signals and a
DTE-DCE command/response format) V.25ter is the familiar AT command set.
Hmmm....
I have an instrument here (an HPIB extender) with 2 DB25's on the back.
One is marked 'RS232 V24' and is clearly a normal-ish serial port to
connect to a modem. The other is for an autodialer and is marked 'RS336
V25' (I think that's the right RS number, maybe RS339). I don't think
From waht I can determine, it uses 'RS232
levels', and transfers a nybble
at a time in parallel to dial a phone number
(digits are encoded in BCD,
the other 6 combinations are used for things like #, * I guess). I found
a pinout for that on the web, and amazingly the pins used in the HPIB
extender would agree with that :-)
-tony
7071
days inactive
7072
days old
3 comments
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alexeyt＠freeshell.org -
ard＠p850ug1.demon.co.uk