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PROGRAMMING
1-
~----------------~~
INTRODUCTION
This section explains how to program the MUX.
The HP 27130B Eight-Channel Multiplexer (MUX) is used for interfacing up to eight EIA
RS-232-C/RS-422-A/RS-423-A
devices
to
Hewlett-Packard
computer
systems using
the
CHANNEL I/O standard backplane. Many of the firmware features of the MUX are programmable
by the user. In addition, each option can be enabled or disabled programmatically. The MUX
firmware provides all necessary line protocol for the support of most terminals.
MUX PROGRAMMABLE FEA TURES
Features and options of the MUX which can be controlled programmatically are as follows:
*
Number of Data Bits Per Character (7 or 8)
*
Number of Stop Bits (lor 2)
*
Transmission Mode (asynchronous only in simplex, half -duplex, full-duplex, or echoplex)
*
Parity (none, odd, even, 0, or
1)
*
Automatic Detection of Baud Rate by Command (baud rate defaults to 9600)
*
Baud rate is programmable from 110 baud to 19,200 baud
*
Break Detection
*
Edit Mode Option to Process Backspace and Line Deletion
*
Backspace Character
*
Line Delete Character
*
Single Text Terminator Character(s)
*
Host ENQ/ ACK Handshaking to Device, with a programmable timeout and a programmable
pacing counter
*
Interrupt on Handshake Timeout
*
Type Ahead Mode
*
Automatic Output Separator(s) Appendage for Transmitted Text
*
In Echoplex, the MUX may be enabled to echo a CR-LF for a Programmable Single Text
Terminator
4-1
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