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Power Tools 1993 October - Disc 1
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a3821429
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1992-05-09
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8-Channel Multiuse Asynchronous Multiplexer Interface, Technical Data
For HP 1000 A-Series Computer Systems
Product Number 12041B
Features
o EIA RS-423-A and RS-232-C/ CCITT V.24 compatibility
o Onboard microprocessor off-loads computer
o Onboard buffering with DMA capability
o Programmable character size, parity checking, and number of stop bits
for flexible control of transmission format
o Parity, overrun, and framing error detection
o Programmable data rates using two baud rate generators to eliminate
hardware speed strapping
o Full-duplex or echoplex transmission
o Includes an 8-port Distribution Panel for mounting RS-232 connections
o Onboard self-test
Functional Description
The HP 12041B is a microprogrammable interface for HP 1000
A-Series computers. These cards are intended to be purchased by
customers who will use them with HP software downloading the
characterizing protocol into 16 Kbytes of on-card RAM memory.
By designing firmware which is unique to a particular application, an
HP division has almost unlimited scope in the variety of different
specialized interfaces that are available to support
application-oriented software products. Because the interface program is
downloaded from software into RAM memory on the card, the interface
never needs to be modified by the addition of EPROMs. This means the
12041B is used and supported as shipped from Roseville Networks
Division. An 8-Kbyte EPROM on each interface contains programs for
self-test, loading, and executing code.
Direct Memory Access Transfers
Each interface card has its own DMA intelligence to control transfers of
data between card buffer and the host CPU backplane. DMA reduces the
time and overhead required to move messages between interface and host
CPU memory.
Onboard Microprocessor Offloads Host Computer
A powerful microprocessor on the interfaces manages routine
communications processing, freeing the host computer for
applications-oriented tasks. Under control of downloaded firmware, the
microprocessor converts command words into actions, such as establishing
a communications link, loading or unloading data from the onboard
buffers to the host CPU. The microprocessor can also perform protocol
generation and interpretation, error checking, error recovery by
retransmission, or general purpose I/O interfacing, all without the
attention of the host computer.
16 Kbytes of RAM
Onboard memory allows messages and associated information to be buffered
on the card either for transmission, reception, or temporary program
storage. Thus, interrupts to the host processor can be kept at a minimum
so the host CPU can be put to better use processing applications.
EPROM-based Self-Tests
A go/no-go self-test, performed at power-up or reset of card, helps to
ensure reliable operation of the interfaces and minimize troubleshooting
time. These tests check out the RAM memory, the Direct Memory Access
operations, baud rate generators, and the I/O parts of the communication
interface and signal self-tests results via the LED indicator. The
self-test can also be run with the supplied diagnostic hood which allows
for the test of the electrical drivers and receivers.
Communications
Interface Level: RS-423-A/RS-232-C or CCITT V.24
Communication Mode: Asynchronous, bit serial
Programmable Communications Parameters: Character length from 5 to 8
bits; 1, 1-1/2, or 2 stop bits; and odd, even, or no parity
Configuration Information
System Compatibility: The 12041B Interface is compatible with
HP 1000 A-Series Computer Systems operating under RTE-A real-time
executive systems.
Computer I/O Slots Required: 1
Software Support: RTE Driver: IDM00
Current Required from Computer Power Supply:
+5 V 2.5 A
+12 V 0.10 A
-12 V 0.05 A
Physical Characteristics
Dimensions: 26.9 cm long by 17.2 cm wide by 1.6 mm deep (11.4 in by
6.75 in by 0.06 in); top clearance, 10.2 mm (0.4 in); bottom
clearance, 5.1 mm (0.2 in)
Weight: 481 grams (17 oz) with mating connector
RS-232 Panel Extension
The 1252-0508 MUX Cable Extender Kit includes 1 set of male and female
connector components which are used with up to 300 feet of HP cable
(P/N 8120-4510) to remotely position the 28658-60005 RS-232-C panel. The
raw cable can be purchased from the Corporate Parts Center.
Ordering Information
The HP 12041B Interface includes:
12041-60012 8-Channel Multiplexer Interface; includes 5180-1968
Download Monitor EPROM
12041-90001 Interface Installation Manual
5001-5278 Mounting Bracket
28658-60005 8-Channel RS-232-C Panel
28658-63005 3-meter EIA RS-232 Cable
1252-0508 MUX Cable Extender Kit
5061-4901 MUX Diagnostic Hood
HP 12041B Option:
003: Customer Connector
Deletes: (28658-60005) RS-232-C Panel (28658-63005) Cable
(1252-0508) Extender Kit(5001-5278) Mounting Bracket
Adds: (5061-3467) Edge Connector Kit
From HP Networking Communications Specifications Guide,
5091-3821E, 9205, p 429
Associated files: none
8-Channel Multiuse Asynchronous Multiplexer Interface, Technical Data