Terminating Resistor Configurations; Rs-232 And Rs-422 Serial Interfaces - Printronix SL5000E series User Manual

nReverse Request. Driven by the host. Resets the interface and forces a
return to Compatibility Mode idle phase.
nData Available / nPeripheral Request. Driven by the printer. Indicates the
printer has encountered an error. (Data bits 1 and 5 in Nibble Mode.)
1284 Active / nAStrobe. Driven by the host. A peripheral device is selected.
Host Logic High. Driven by the host. When set to high, the host indicates all
of its signals are in a valid state. When set to low, the host indicates its power
is off or its signals are in an invalid state.
nInit. Resets init interface from the host.

Terminating Resistor Configurations

The factory equips the printer with terminating resistors that are used for
parallel interface configurations suitable for most applications. The 470 ohm
pull-up resistor pack is located at RP2, and the 1K ohm pull-down resistor
pack is located at RP1 on the Controller PCBA.
If the values of these terminating resistors are not compatible with the
particular interface driver requirements of your host computer, call your printer
service representative.

RS-232 And RS-422 Serial Interfaces

NOTE: The RS-232 and RS-422 serial interface circuit characteristics are
The RS-232 and RS-422 serial interfaces enable the printer to operate with bit
serial devices that are compatible with an RS-232 controller. The input serial
data transfer rate (in baud) is selectable from the printer's control panel. Baud
rates of 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, and 115200 are
available.
NOTE: If you select a baud rate that is greater than 19200, you may need to
The length of the data cable from the host computer to the printer must not
exceed 50 feet (15 meters) for RS-232 or 4000 feet (1220 meters) for RS-422.
(A copper conductor, twisted-pair telephone cable with a shunt capacitance of
16 pF/foot [52.5 pF/meter] terminated in a 100 ohm resistive load must be
used for the RS-422.)
compatible with the Electronic Industry Association Specifications
®
EIA -232-E and EIA-422-B.
use RS-422 to prevent data loss. You may also need to increase the
Buffer Size in K parameter from the default (1 Kbyte) to improve
performance.
Terminating Resistor Configurations
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