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I may have one of those cables already or I can make one if you have the pinouts.  No sense in my ordering one since you'll have your G2 before I'd get it.

From the CM11A specs:

2.1 Cable connections:

        Signal  DB9 Connector   RJ11 Connector
        SIN       Pin 2           Pin 1
        SOUT    Pin 3           Pin 3
        GND      Pin 5           Pin 4
        RI         Pin 9           Pin 2

where:  SIN     Serial input to PC (output from the interface)
         SOUT    Serial output from PC (input to the interface)
          GND     Signal ground
           RI       Ring signal (input to PC)

Obviously, you don't need the Ring signal for this application.

I may have one of those cables already or I can make one if you have the pinouts.  No sense in my ordering one since you'll have your G2 before I'd get it.

It's been a number of years since I've done this stuff.  Since I only have USB ports to work with, can I connect the Harmony to a laptop via a USB cable and use an emulator like Putty or MobaXterm to see what's going on?

I haven't used either of them, but that may work.  I've been using Termite on my ancient Win98 laptop.

Note that the XTB-232 / XTB-XM emulates the CM11A serial port.  So a USB to serial adapter must be used with the Harmony along with a CM11A cable:  https://www.ebay.com/itm/380474050324

Jeff

It's been a number of years since I've done this stuff.  Since I only have USB ports to work with, can I connect the Harmony to a laptop via a USB cable and use an emulator like Putty or MobaXterm to see what's going on?

Can I capture that with the XTBM? Just let me know what to look for & I'll have it done today.

No, this would be the serial data between the Harmony and the IM at power-up.  A simple test would be to connect the Harmony to a terminal emulator (19.2KBaud) and see what it sends at power-up.  Hopefully it is just the Reset and Get Version commands.  Then an RS232 splitter can be used to see what the Harmony echos back.

Of course, maybe it does nothing to establish communication, and just relies on the echo and ACK/NAK coming back.

Jeff

Can I capture that with the XTBM? Just let me know what to look for & I'll have it done today.

Walmart said the G2 won't be here for another week.  So it would really help if someone could capture what the Harmony uses to establish communication with the IM.  I supported the Reset and Get Version commands in the XM.  Hopefully that is all the Harmony needs.  If so, I'm ready to send out a Beta version.

The pre-set dim conversion works on transmit only.  It will expand the pre-set dim to an extended command only when there is a 2-command sequence of the house/unit select followed by a pre-set dim command.  This works for pre-set dim commands sent from HomeVision.  Since I don't yet have a Harmony (G2 ordered), I can't confirm that it also sends the house/unit & pre-set dim command pair.

While the firmware includes the left-over code for receiving extended commands, it presently just indicates it received an extended command and the extended portion of the command is ignored.

Jeff

FWIW, although I have little to no use for this solution, I would have voted for the jumper option. 

(I was on vacation for a week and not checking forum posts.)

Since there has been no feedback on how to enable converting pre-set dim to extended commands, I chose what should be the most universal.  When a jumper is added inside the XTB-XM, it will transmit the extended command doublet after the pre-set dim command.  The extended commands are sent as a doublet so the XTBR and XTB-IIR will repeat them as it does for the CM11A, CM15A, and Ocelot.  And when enabled, the ACK is sent to the Harmony when the extended transmission ends, delaying it about a second.  Hopefully that will not be a problem.

I have not heard back from Smartenit regarding a used or loaner Harmony, so I will have to buy a G2 for testing.

Jeff