User`s manual

5–8 Interfaces
Terminating Resistors
For parallel interface configurations, the LG06 and LG12 printers are
equipped with 470 ohm pull–up terminating resistors, located at 12C on the
Common Controller Board (CCB) and 1K ohm pull–down terminating
resistors at location 12D. These are suitable for most applications.
If the standard terminating resistor pack is not compatible with the particular
interface driver requirements of the host computer, other values of pull–up
and pull–down resistors may be required. Digital provides the 220 ohm
pull–up and 330 ohm pull–down alternate terminating resistors. If the 220
ohm pull–up resistor is installed, the 330 ohm pull–down resistor must also
be installed. Possible terminating resistor combinations are shown below.
Pull–up at 12C
Pull–down at 12D
470 ohm
1K ohm
220 ohm
330 ohm
1K ohm
none
Removing and installing terminating resistors requires removal and
modification of the CCB. This procedure is not recommended for end users;
if required, it should be performed by a trained field service technician.