Intermec 3400 User Manual page 72

3400, 3440, and 3600 Bar Code Label Printer User's Manual
Hardware handshaking uses pin 11 or pin 20 of the RS-232 interface to control
data flow. When the printer is using Intermec Standard protocol, it holds pins
11 and 20 high when the printer is ready to receive data. The printer holds the
pins low when the printer is in one of the following conditions:
Your printer uses XON/XOFF protocol for software handshaking. When the
input buffer is full, the printer transmits an XOFF character. The XOFF
character alerts the host to the fact that the printer buffer is full and cannot
receive any more data. When the printer is ready to receive more data, it sends
the XON character.
The following procedure lists things to check to ensure that your printer and
host system are communicating properly.
To check for communication problems
1. Check the cabling from the printer to the host system.
2. Check the interfacing of the devices that are communicating with the
3. Check the printer for proper electrical operation of the I/O port.
4. Test to see that the host system is not overrunning the printer's input
5. Check to see that the data string being sent to the printer contains the
4-8
Buffer full
Ribbon fault
No label stock
Label at strip bar
printer.
buffers.
correct information.
NugFont
HelvC
C o d e 39