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Is V. 24 protocol compatible with RS232?
In effect CCITT V.24 is the equivalent European version of the RS-232 rev E standard. The only changes from prior versions (RS232 rev C and D) are minor. E.g. they added an option for a 26 pin connector (and pin 26 is unused, so it's basically just the 25 pin connector in a different format). All RS-232 devices should talk to V.24 devices and vice-versa.
Rev C spec's a max cable length of 15m. Rev D & E changed that to a max capacitive load of 2500pF. Rev D imposed a maximum rise time through the transition region of 5us or 4% of the bit time. Rev E just says 4% of the bit time. There is a 30V/us max slew rate.
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E1 to V.35 or V.24 Protocol Converter
Just to be clear, and I think you already know this, technically, there is *no* RS-232 standard showing how data bits are related to signal levels, and never will be because RS-232 is a level-zero = "physical" level standard. It defines wires, voltages, pins, etc... What travels on that layer, the level-one or "transport" layer, is something else again. Asynchronous serial at a given baud rate is only *one possible* transport layer. Others are Bi-Sync, Manchester, HDLC/ NRZI etc. However, when most people say "RS232" they are talking about both the electronics AND the timing, meaning, etc... of the signals.
So both V.24 and RS232 actually only define the electronics, but some people will "disambiguate" by saying V.24 when they are talking about just the electronics, and RS232 when they are talking about async serial over V.24.
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