Xerox 4235, Руководство по планированию установки

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SYSTEM CONFIGURATION
6–14 XEROX 4235 LPS INSTALLATION PLANNING GUIDE
Serial interface information
Serial data communications allows data to transmit
sequentially, one bit at a time, over a single wire.
The 4235 LPS supports asynchronous, SNA/SDLC, and
bisynchronous serial communications. The interface
connections conform to the RS232–C standard of EIA and
CCITT regulations V24/V28. Point–to–point operation is
supported and may occur over switched or leased lines in half
or full duplex mode. The connector used on the 4235 LPS is a
25–pin female "D" type.
You must configure the 4235 LPS for EBCDIC character
encoding when it is used with a host computer system that uses
EBCDIC. When the text is EBCDIC encoded, you must use
transparent transmission to download ASCII encoded fonts.
SNA/SDLC
In XDPM, the internal SNA/SDLC interface allows the 4235 LPS
to function in either of two modes: as a simulation of an IBM
3777 (IBM mode) or in Xerox Pass Through mode. Data is
accepted in either the 4235 LPS or punch ports. IBM mode and
Pass Through mode selections have no effect in XPPM.
Asynchronous
The asynchronous interface uses two 2,000–byte input buffers
and supports ETX/ACK and XON/XOFF protocols at data rates
between 300 and 19,200 bits/second. Asynchronous
communication is not supported in XPPM.
Bisynchronous
The bisynchronous communication interface allows the 4235
LPS to respond to IBM 2770, 2780, or 3780 protocols. Data is
accepted in either the 4235 LPS or punch ports.
Note: PCL4 and XScript are not supported in bisynchronous.