First, an apology. When answering a question related to the connection of the C-M loop's RS-232 port to an Icom CT-17 converter, although the pin connections were correct, I mislabelled the transmit and receive data lines. A subsequent query was eventually resolved by reversing the TDX and RXD lines, but that caused me to think why that should be. I eventually discovered that the schematic in the Icom CT-17 User Instruction manual was incorrect, they had reversed the TXD and RXD labels. The actual connections to a Ciro-Mazzoni RS-232 port, and verified with an oscilloscope are:

Pin Name Input/Output Idle Voltage

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2 Rx Data I

3 Tx Data O -8V

4 DTR O +8V

5 GND

6 DSR I

7 RTS O +8V

8 CTS I

Again, my apologies for the previous incorrect data.

Adrian, 5B4AIY