Situation 1: I’m using a USB-to-RS232 adapter cable.
Be sure the Remote Control Headend Program has recognized your adaptor cable. Here’s how:
Un-plug the USB cable from the computer.
Get to the starting window of the Headend Program.
Right-click over the name of the system. This should bring up “edit” and “delete”. Click “edit”
Check the “Using Port” drop-down menu to see what COM choices the computer has available at this point.
Plug in the USB cable to the computer.
Close the Edit window, which takes you back to the starting window of the Headend Program.
Right-click (again) over the name of the system. Click “edit”.
Check the “Using Port” drop-down menu for the NEW port that has been added. Make this the “Using Port” selection.
Close the edit window and use the Headend Program normally.
Situation 2: The equipment connects directly to the COM port on the Computer.
Be certain the RS232 cable is a 9-pin “straight thru” cable. It is OK to use a 25-to-9 pin adapter or a gender changer if needed, but NOT a “null modem” adapter or cable.
Additional Notes on RS232:
Be sure to connect to the rear panel ‘IN’ connector and not the ‘OUT’.
Be sure the baud rates are set the same for all connected units and the PC (4800, 19200, etc). This can be reviewed and set from the front panel on Drake units. This also goes for the SCTeci, if it is used.
Check that the “Unit ID” has been set correctly. Remember, if the Unit ID is “0”, it will ignore RS232 commands.