Microcom 428TM Operator's Manual page 25

Chapter 3 Getting Started
Set the COM parameters up for 115200,n,8,1 and Hardware flow control and select OK.
Type ^D29 in the window (you will not see the characters being echoed back, this is okay)
and press the Enter key.
You should see information from the printer reported to the screen if communicating
properly.
Type a ^A1^D108 followed by the Enter key to change the active port to Ethernet. Power
cycle the printer and the unit should be configured for Ethernet operation.
428TM Operator's Manual - 880042-0141 3-9