SCSI Port 40 and Port 38

[FlorianJ]

Hello community,

I'm currently controlling a board that used to be controlled by MATLAB via a SCSI connection. Everything seems to work fine, however the last step to capture my data is blocked by PIN 40 and PIN 38 of my 68 pin connection.

I didn't find out whether I can control those pins or not.

So my question is, can I control them, and how.

I would greatly appreciate a small example.

thanks in advance

Florian

P.s.: I want to add that I'm using a NI PCI-DIO-32HS card. Labview version is 7.1

Message Edited by FlorianJ on 04-20-2010 09:58 AM

[Duffy2007]

Hello FlorianJ,

here the discription from the maual NI 6533/6534 for NI-DAQmx Help

Power-On State
When the computer is first powered on, all digital lines are configured for input and are in the high-impedance state. By default, the data and control lines in the NI 6533/6534 are pulled down, even if the CTRL PULL and DATA PULL are disconnected. You can select the biasing of control and data signals using the CTRL PULL and DATA PULL lines:

• CTRL PULL line—For control lines, the CTRL PULL line is a user-configurable 2.2 kO internal resistor. You can connect the line to +5 VDC (pull up) or connect the line to ground (pull down). For example, if you are using active-low handshaking signals, you can connect the CTRL PULL line to +5 V to place the handshaking lines in the high, inactive state at power on.
• DATA PULL line—For data lines, the DATA PULL line is a user-configurable 100 kO internal resistor. You can connect the line to +5 VDC (pull up) or connect the line to ground (pull down). 

Caution  Do not connect CTRL PULL, DATA PULL, or any other line directly to an external power supply while the NI 6533/6534 is powered off. This action may prevent your computer from restarting.

Here are also additional informations

Configuring NI 6533 and 6534 Devices for Wired-OR (Open Collector) Output Mode In LabVIEW

Internal Pull-up/Pull-down Resistor Values on the Digital I/O Lines of Data Acquisition Devices

How Can I Pull Up/Down Individual Digital IO Lines on the 6533 or 6534 DIO Boards?

I hope this helps.