Microcom 428LT Operator's Manual page 70

Chapter 5
port will be selected if the USB cable is not plugged in and a character comes
in on the RS-232 port. The printer will continue to scan both ports until one or
the other condition is satisfied.
1 Ethernet: When this command is sent to the printer, the Optional Ethernet
port is the active communication port. The Ethernet port is configured for an
IP address of 192.168.200.3, a NET mask of 255.255.255.0, on Port 9100
when shipped from the factory.
4 USB: When the command is sent to the printer, the active port will always be
the USB port under normal operation. This is used on systems where the
USB connection is lost on a Host power cycle. If your system is unable to
reconnect to the USB without hard cycling the power, it is recommended that
you set the active port the USB. Please note that when entering the printer's
diagnostics mode, the printer will continue to use Autodetect regardless of the
^D108 command setting.
5.2.2.3 Set Serial Port Source Command (Volatile - ^D109)
This command is similar to the ^D108 command, except the ^D109 command immediately
switches between the 3 serial ports without the need to cycle power. Settings made with
^D109 command are NOT saved on power-down. The printer returns to the original port
setting on the next power-ON.
Note: The Auto Select option is not available with the ^D109 command.
^A ^D Command
X 109 Serial Port Source (volatile)
0 RS-232
1 USB
5.2.3 Print Head Size Commands
The different printer models may be configured with a variety of different print head sizes
and densities. The ^D78 and ^D79 commands (non-volatile) allow the printer to be setup
through software to configure the different print head sizes and densities. Power cycle or
^D32 is required before command settings take affect.
Note: When using these commands, the ^D79 command MUST be sent prior to the ^D78
^A ^D COMMAND
X 79 Set print head dots/inch (dpi). This command sets the dot density of the
print head.
0 203DPI: This sets the printhead resolution to 203dpi. This requires that a
203dpi printhead is installed on the printer. If the setting is not set properly,
the printed image could produce
1 300DPI: This command tells the printer to use the Ethernet port the next time
it powers up. The Ethernet port is generally a third party device that provides
the printer with the connectivity of an Ethernet system. Internally, the signals
go into a serial port. The Ethernet is setup and configured separated from the
428LT Operator's Manual - 880040-0200
Printer Commands
5-27