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Hi Peter
Ok I've traced all the pins. Nothing special about this IC circuit, pretty much follows the manufacturers layout specs.
Rj11 pin 1 is not connected.
Rj11 pin 2 is earth.
Rj11 pin 3 (RS232 Rx in) goes to pin 8 of U6.
Rj11 pin 4 (rS232 Tx out) goes to pin 13 or U6.
U6 pin 9 goes to U1 (CPU) pin 71.
U6 Pin 11 goes to U1 (CPU) pin 72.
It's unlikely that the IC, U6, is dead if the charge pumps work. These charge pumps are used to transition voltage levels in the IC to usable levels for the circuit.
More than likely you have a bad RS232 cable! Did you try the Bluetooth module as a RS232 I/O (with it's own cable) and Gemini ASCOM?
Anyway lest see how you go with this. The pins are very hard to measure, you don't need to do this they are just put in for info.
Oh I have attached a diagram of the Gemini RJ11 socket designation and U6 connections.
Brendan
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