On my display I use port 2 for the connection to Do-more. Requires cable EA-2CBL.
For port 1 you need cable DV-1000CBL.
For the Display Panel make sure you select PLC Protocol: AutomationDirect Do-more Serial.
Double check you Baud Rates are the same for the Do-more and the display. (Panel Manager under Function Tab)
The display panel Port 1 is 9600 only.
Sense I use Port 2 I use a faster Buad Rate of 38400
Other settings:
Parity: None
Stop bit: 1
Data Bits: 8
Then send the project to the display panel.
On the Do-more check your settings Under PLC Menu: System configuration: CPU Configuration: Serial Port Mode set to Do-more Programming, then click on Device Settings... and set Baud Rate, Data Bits, Stop Bits and Parity to the same as the display panel. Transmit Control should be Unconditional and RTS Control should be Follows Transmitter.
Should work as it works for me.
Best test is create a button for the display panel that turns C1 ON and OFF.
With the Do-more running, setup a Data Display Element with C1 and turn on the Status for Data.
Should see the state of C1 change with press of the button on the display.
Also see the free video on the Do-more Serial at
http://www.aboutplcs.com/do-more/support/VidSerial.html