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Setup
Connecting your Printer to a Computer
1/13/2016 ZD420 User’s Guide 212485-001 Rev. A
Serial Interface
The printer uses a Null Modem (cross-over) cable for DTE communications. The required cable
must have a nine-pin “D” type (DB-9P) male connector on one end which plugs into the mating
(DB-9S) serial port located on the back of the printer. The other end of this signal interface cable
connects to a serial port on the host computer. For pin-out information, refer to Appendix A.
The serial port communication settings between the printer and host (typically a PC) must match
for reliable communication. The Bits per second (or Baud rate) and Flow control are the most
common settings that get changed.
Serial communications between the printer and the host computer can be set by:
• ZPL programming ^SC command
• Resetting the printer to its default printer configuration.
Factory defaults for serial communication settings are: 9600 baud, 8 bit word length, NO parity, 1
stop bit, and XON/XOFF (‘Software’ data flow control in the Windows based host system).
Note • Do not use RS-232 cable adapter dongles (DTEDCE) with this printer. Some dongles can
interfere with the operation of USB Host port devices at printer power up.
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