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XX-8567C-18

2000

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Document:	DEC-VAXBI-AsynchronousCommsController
Order Number:	XX-8567C-18
Revision:	0
Pages:	2
Original Filename:

OCR Text

DHB32

VAXBI Asynchronous Communications Controller

Simplify Your VAXBI Operation
The DHB32 is an asynchronous communications controller designed

specifically for Digital's VAXBI systems. The DHB32 enables up to
sixteen terminals, modems, and serial printers to directly communicate
with a VAXBI processor. The DHB32 connects directly into a slot
on the BI backplane, with a maximum of four DHB32’s per BI bus.

Intended for efficient use of the VAXBI bus, the DHB32 relieves the
VAX processor and bus of much of the overhead associated with
handling communications lines. Using its own microprocessor and
memory, the DHB32 transfers data directly to and from VAX
memory, controls the sixteen asynchronous channels concurrently,

and checks for errors.
‘The DHB32 option includes one module controller and a cabinet kit
that is available in an EIA232 version or a DEC423 version. The

EIA232 version includes a distribution panel with sixteen asynchronous
channels having full modem control. The DEC423 version has sixteen
DECconnect channels for terminal connection only. However, there
are also two EIA232 channels on the DEC423 distribution panel
which have modem control. By using a switch, these two channels can

be used for connecting modems and the other fourteen DECconnect
channels can be used to accommodate terminals.
The DHB32 emulates the asynchronous portion of Digital’'s DMB32
communications controller by using similar architecture and the same
VMS driver. The functionality offered by the eight asynchronous

channels on the DMB32 is extended to sixteen channels on the
DHB32. Unlike the DMB32, there is no synchronous or parallel
printer channel support on the DHB32.

Highlights

+16 asynchronous data channels

DHB32 - EIA232 Version:
DISTRIBUTION

for control of local terminals,
modems, or serial printers.

PANEL

LOCAL
TERMINALS

—

«Direct Memory Access (DMA) or
single-character programmed

VAXBI

SYSTEM

PRINTERS

transfers to and from host
memory.

«Programmable split-speed oper-

ation with automatic flow con-

=
=
ooe]
e

trol of transmitted and received

cmel.

«Full modem control including

MODEM|

full duplex, auto-answer dial-up

DHB32 - DEC423 Version:
DISTRIBUTION

with DEC423 version.
«Supported by VAX/VMS Oper-

PHONE PLUGS

SYSTEM
8 TERMINALS,

ating System, Version 4.6 or

higher.

PRINTERS

caBLES

+Guaranteed throughput of 19,200
bps on 2 channels with 9,600 bps
on remaining 14 channels

simultaneously.

PANEL

VAXBI

TERMINALS,
PRINTERS®

[vooev]

«Full range of diagnostics com-

patible with the DMB32.
Digital believes the information in this publication is accurate as of its publication date; such

Rs232
* 1f Modem Connection is not needed, all § MMJ Connections can be used.

information is subject to change without

notice. Digital is not responsible for any
inadvertent errors.

Specifications

‘The following are trademarks of Digital

Signal Compatibility

Equipment Corporation: DEC, DECsystem-10,
DECsystem-20, DECUS, DECmate, DECnet,

EIA232 Version:

Electrically and mechanically compliant with
EIA RS-232-D (replaces RS-232-C), and
compatible with CCITT V.28/V.24 standards.

DEC423 Version:

All 16 channels conform to DECconnect

DECwriter, DIBOL, the Digital logo, MASSBUS,

PDP, P/OS, Professional, Rainbow, RSTS, RSX,
ULTRIX-32, UNIBUS, VAX, VAXBI, VAXELN,
VMS and VT,

DEC423 (Type III connectors). Channels 14
and 15 are switchable between DECconnect

DEC423 and EIA RS-232-D.
Power Requirements:

+ 5 Vdc +5%

A
at5.56

+12 Vdc +3%

at 420 mA

—12 Vdc +3%

at 420 mA

For more information about the VAXBI systems and their peripheral
controllers, contact your local Digital sales office, or call 800-8326277. In New Hampshire call (603) 884-8990.

operation with EIA232 version.
«DECconnect terminal connection