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4-4 Installing the DynaRes

11-09-01

DataShuttle and DynaRes

Measuring Current

If you are going to connect a current, rather than a voltage, to one or more of the analog input channels,

then make certain to set the “Current/Volt” switch for that channel on the terminal panel. These switches are

located under the daughterboard on the T71 terminal panel (see Terminal Panels manual for illustration).

Moving a switch to the “Current” position selects current, placing a precision 24.9

Ω

, 0.1% resistor in the

circuit for that channel.

&$87,21

Two kinds of misuse can burn out the board’s input sense resistors:

Do not apply a voltage to a channel whose setting is for current.

Also, do not apply more than 50 mA to a channel set for current.

Setting the Board Number Switch

Multiple Boards

When you are using multiple boards in your installation, each board needs to have an identity for the

software to recognize it as an “individual.”

The Board Number switch on a board accomplishes this, as it enables you to set an identifying number for

the board (see the illustration on page 4 – 2).

This number determines, among other things, the sequence in which the software reads multiple boards

(application programs can address as many as 15 boards).

When using more than one DynaRes product in your installation, every board’s Board Number switch needs

to have a different number setting, and all switches are to be in number sequence, starting with 1. For

example, if you are using three boards, the board number sequence would be 1, 2, 3. Set the address and

interrupt on all boards to the same settings.

Single Board

If your system includes just a single data acquisition board, then you don’t need to have much concern

about the Board Number switch.

When your DynaRes leaves our manufacturing facility, we set the Board Number switch to 1, and this is the

setting we recommend for most purposes when you are using only one board in your installation.

Disabling Boards

If you want to disable the board, for any reason, set its Board Number switch to 0. This is handy if you want

to use fewer boards: that way you don’t have to remove them from the computer. Remember, however, that

all remaining boards must have their board numbers in a continuous sequence.

Setting the Switch

To Set the Board Number Switch

1. Locate the Switch With the cover of your computer removed, examine the illustration on page 4 – 2 in

this chapter and find the “Board Number Switch” on the DynaRes.

On the printed circuit board, this is a rotary switch with the label “BRD SEL.”

2. Make the Setting Note that the switch has 16 possible positions: numbers on the detents are 0 through 9

and A through F.

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Measurement-computing DataShuttle Manuale Utente Pagina 44

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