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9323 Hamilton
Mentor, Ohio 44060 - USA
Tel:+1-440-357-1400
Fax:+1-440-357-1416
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Scientific Solutions ® Inc.,
LabMaster ® DMA Screw Termination
LabMaster DMA PC Interface Card shown
with Screw Termination DeskTop
unit
Inside the DeskTop unit is the
External ADC card and the Screw Terminal board.
Description
of the LabMaster DMA Screw Terminal Product
The LabMaster DMA product consists of two cards;
The LabMaster DMA PC
Interface which is installed inside the computer, and the LabMaster DMA
External ADC card which is normally housed in a DeskTop unit away from
any internal computer noise. In this configuration we have also
added a full custom screw terminal inside the DeskTop unit.
The DeskTop unit has a screw terminal pair (signal and ground) for
every
LabMaster
DMA signal including:
- Analog Input
- 16 signals, Ain 0 to Ain 15
- Analog Output
- 2 signals, Aout 0 and Aout 1
- Digital I/O
- 24 signals
- Digital I/O Ports A, B and C (8-bits each port)
- Counter/Timer
- 16 signals
- Out 1 thru Out 5
- Source 1 thru Source 5
- Gate 1 thru Gate 5
- Fout
- Control Signals
- 6 signals
- External Start-of-Conversion, Conversion Done
- Digital +5 volts, Logic +5 volts, Analog Ground, Digital Ground.
A light on the front of the DeskTop until illuminates when the computer
power is on.
LabMaster
DMA Screw Terminal DeskTop unit:
The DeskTop unit is about 11" wide x 7" deep x 2" high (280mm x 180mm x
50 mm). The front of the DeskTop unit has slots for signal
wires.
Front View of DeskTop unit with slots
for wires to connect to the internal screw terminals.
Inside the DeskTop unit is a full screw terminal. To access the
screw terminal, clips in the four corners of the top are "popped off"
with a small flat-bladed screw driver. Under each clip is a
philips screw that is also removed. Be sure to save and not loose
the screws as they are metric thread and difficult to replace.
There are two cards inside the unit, the LabMaster DMA External ADC and
the Screw Terminal card. These two cards are connected with
ribbon cables, so when the top is lifted off it is best to place it
behind the unit. Also the Screw
Terminal Board
internal to the DeskTop Unit includes all the header connections that
are on
the LabMaster PC Interface card for those applications that require
ribbon
cable connections. It provides the best of both worlds - an
easier cabling to
the PC Interface along with compatible ribbon cable connections for
your
existing equipment.
Inside View of DeskTop unit showing
External ADC card and the Screw Terminal board
Close Up View of Screw Terminals
inside the DeskTop Unit.
The Back of the DeskTop unit has connections for the LabMaster DMA PC
Interface. There are four connectors on the back of the DeskTop
Unit. Three of them are used to connect to the LabMaster DMA PC
Interface. The fourth connection is the Port C Digital I/O
signals and is here just for convenience for certain applications.
Back View of the DeskTop unit showing
connections for the LabMaster PC Interface
Connecting
the LabMaster DMA PC Interface to the DeskTop unit:
In the past, users of the LabMaster DMA used ribbon cables from
the LabMaster DMA PC Interface (located inside the computer) to
external devices. The same ribbon cable connections
are still available on the PC interface to support customers using this
arrangement. However, for this product we have also added a
special card - The LabMaster DMA I/O card - that snaps directly onto
the LabMaster DMA PC Interface and converts the many ribbon cable
header connectors to a high density connector.
This arrangement allows us to fully support customers who have been
using the ribbon cable connections for many years with our standard
LabMaster DMA PC Interface in addition to adding enhanced products such
as the Screw Terminal DeskTop unit that use more convenient
"quick-disconnect" round cables. The LabMaster DMA I/O card
replaces the several ribbon cables with a high-density round cable that
permits quick and easy connection between the PC expansion card and the
desktop unit.
There are jumpers and switch blocks on the LabMaster DMA PC
Interface that are used to configured some of the features of the
product. The cards are separated to configure the card and then
are
snapped back together for installation in the computer.
LabMaster DMA PC Interface and I/O card shown separated.
With the I/O card attached to the LabMaster DMA PC Interface there
are three
connections
available:
- High density connector on the back of the card
- External ADC data and control for the Analog Input signals
- Counter / Timer Signals
- 8 Digital I/O signals (Port A bits 0-3 and Port B bits 0-3)
- Control Signals such as Start-of-Conversion and
End-of-Conversion
- 3.5mm (1/8 inch) MiniJack connector on the back of the card
- Two Analog Output signals from the PC Interface to the DeskTop
unit.
- 26 pin header connector on the top of the card (between the PC
Interface and the I/O card)
- All of the Digital I/O signals are on this connector
- Port A bits 0 to 8, Port B bits 0 to 8 and Port C
bits 0 to 8
The DeskTop Unit connects to the LabMaster PC interface using
three
cables (all
supplied with the unit!!):
- High Density round cable ("quick-connect")
- 3.5mm cable
- 25 pin round cable (connects to the 26 pin header on the
LabMaster I/O card)
Most applications only require the High-Density Round Cable and the
3.5mm
cable. The additional 25 pin Round Cable is for those
applications
that
require all 24 Digital I/O signals. With only the High-Density
Round Cable and the 3.5mm cable you have access to all of the Analog
In, Analog Out, Counter/Timer, Control and 8 bits of Digital I/O.
For those applications that
require all 24 of the
Digital I/O signals, then a cable is connected internal to the
computer
from
the I/O card to a standard DB25 connector on an ISA bracket (included
with
product). The connector and bracket mount in another slot
location of the computer. Then a 25 pin external round cable
(also included with
product)
connects from the
DB25 connector on the bracket to the back of the DeskTop Unit.
Although many applications do not need this additional Digital I/O
capability, all the cables are included so you always have the option..
LabMaster DMA PC Interface shown
connected to DeskTop Unit
Specifications subject to change without notice.
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