Host Bus VAXBI backplane, any slot except K1J1
Ports
- Eight full-duplex asynchronous data
- One synchronous
- One line printer port
Description
===========
The DMB32 is a communications adapter of the VAXBI family. It is an
intelligent synchronous/ asynchronous multiplexer that provides eight
full-duplex asynchronous serial data channels, one synchronous data channel,
and one line printer interface on VAXBI systems.
Features
========
Single VAXBI module (T1012) and distribution panel (H3033)
Eight full-duplex asynchronous (async) data channels
One synchronous (sync) data channel
One line printer port. The DMB32 printer port supports the LP32
generic printer specification. This includes the LN01, LN01-B, LN01-S,
LP25, LP26, LP27, LXY12 and LXY22 printers
Direct Memory Access (DMA) or single-character programmed
transfers to and from host memory
On-board virtual-to-physical address translation allows the
DMB32 to handle data buffers in their virtual address format
Large 512-entry First-In, First-Out (FIFO) buffer on the async
channels for received characters, dataset status changes, and diagnostic
information
Async ports are electrically and mechanically compliant with
RS-232-C and compatible with V.28/V.24
The sync port is electrically and mechanically compliant with
RS-232-C, RS-422-A/RS449, V.11, X.25, and V.25, and compatible with
RS-423-A/RS-449, V.28/V.24, V.10 and X.26
IBM bisync, SDLC/HDLC, and DDCMP protocols are supported on the
sync port. NRZI support is also provided
General byte (GENBYTE) protocol provides basic framing and data
transfer facilities to implement other byte-oriented protocols on the
sync channel
Full-duplex point-to-point or auto-answer dial-up operation
Programmable split-speed operation
Total module throughput is 21000 characters per second
Automatic flow control of transmitted and received data on the
async channels
Self-test diagnostics
Programmable loopback modes and test facilities
There are no switches on the module or the distribution panel.
Each external cable for the sync channel is electrically coded to select
a specific CCITT/EIA standard. Other line characteristics are set under
program control.
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