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NATIONAL
INSTRU MENTS
The Software is the Instrument
®
®
Installation Guide
SH6850 Shielded Cable
This guide describes how to use the SH6850 shielded cable to connect either a 68-pin MIO
Series board to a 50-pin MIO accessory or a 50-pin MIO Series board to a 68-pin MIO
accessory. In this guide, the AT-MIO-16, AT-MIO-16F-5, AT-MIO-16X, NB-MIO-16, and
NB-MIO-16X are referred to collectively as the MIO-16 Series boards. The newer MIO-16E
Series boards include the AT-MIO-16E-2 and the AT-MIO-16XE-50.
Introduction
The SH6850 shielded cable is a 1, 2, 5, or 10 m round cable, which has a 68-pin female
connector at one end and a 50-pin female connector at the other end. The SH6850 shielded cable
kit also includes a 3 in. ribbon cable and replacement brackets for the 50-pin AT-MIO Series
(AT-MIO-16, AT-MIO-16F-5, and AT-MIO-16X) and NB-MIO Series (NB-MIO-16 and
NB-MIO-16X) boards. The SH6850 shielded cable brings the pinout of your MIO Series board
I/O connector, which has either 68 or 50 pins, to the MIO accessory I/O connector, which has
either 50 or 68 pins.
What You Need to Get Started
SH6850 shielded cable in one of four cable lengths: 1, 2, 5, or 10 m
SH6850 Shielded Cable Installation Guide
Either a 68-pin MIO board and a 50-pin MIO accessory
or
A 50-pin MIO board and a 68-pin MIO accessory
Small Phillips-head screwdriver
In addition, you need the following components to connect a 68-pin MIO board to a 50-pin
accessory:
3 in. 50-to-50-pin ribbon cable
_____________________________
Product and company names are trademarks or trade names of their respective companies.
371187A-01© Copyright 1993, 1994 National Instruments Corporation. All rights reserved.August 1994
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In addition, you need the following components to connect a 50-pin MIO board to a 68-pin
accessory:
Either a replacement bracket for 50-pin AT-MIO Series boards
or
A replacement bracket for 50-pin NB-MIO Series boards
You can use the brackets to modify your 50-pin MIO board so that you can connect it to a 68-pin
MIO accessory via the SH6850 cable.
Installation
Connecting a 68-Pin Board to a 50-Pin Accessory
Figure 1 illustrates how to connect the SH6850 shielded cable and the 3 in. ribbon cable to a 68pin MIO board and a 50-pin MIO accessory.
Step 4
50-Pin Accessory
68-Pin MIO Board
Step 2
Step 5
SH6850
Shielded Cable
Step 3
3 in. Ribbon Cable
Figure 1. 68-Pin MIO Board Connection
To install the SH6850 cable to a 68-pin MIO board and a 50-pin MIO accessory:
1. Install your MIO board in a slot in your computer, following the instructions in your MIO
board user manual.
2. Connect the 68-pin connector of the SH6850 shielded cable to the 68-pin I/O connector of
your MIO board.
3. Connect the 50-pin female connector (the end with the grounding strap) of the SH6850
shielded cable to the 50-pin male connector of the 3 in. ribbon cable.
4. Connect the female connector of the 3 in. ribbon cable to your accessory.
5. Fasten the shield ground strap to the SH6850 shielded cable so that the strap is not dangling.
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Connecting a 50-Pin Board to a 68-Pin Accessory
Bracket Replacement
Before you install the SH6850 to a 50-pin MIO board and a 68-pin MIO accessory, you must
replace the bracket of your MIO board with the appropriate bracket from the SH6850 kit, unless
your MIO board already has a bracket with a grounding strap tab. If your MIO board has a
bracket with a grounding strap tab, skip the next page and go to the SH6850 Connection section.
1. Turn off the power to your computer.
2. Remove your MIO board from your computer.
3. Unscrew and remove the two screws that attach the bracket to the MIO board.
4. Remove the bracket from the board. See Figure 2 for NB-MIO board bracket removal or
Figure 3 for AT-MIO board bracket removal.
Bracket
NB-MIO Board
Figure 2. Removing the Bracket from an NB-MIO Board
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Bracket
AT-MIO
Board
Figure 3. Removing the Bracket from an AT-MIO Board
5. The 50-pin I/O connector on your MIO board may have small plastic key inserts installed for
mating with military polarized connectors. Because these keys are incompatible with the
50-pin connector on the SH6850 shielded cable, you must remove them. The 50-pin SH6850
connector has a center polarization bump that prevents you from inserting the connector
upside down.
To remove the key inserts, use a thin probe such as a pencil or a pen tip to gently press down
on the release tab in the center of the key insert (see Figure 4). Then use the probe to lift up
the back end of the key insert and slide the insert off the connector.
MIO Board
Figure 4. Removing the Key Inserts
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6. Identify the appropriate replacement bracket for your MIO board from your SH6850 kit. The
bracket that you use should look like the one you remove, except that the new one has an
extra tab that mates with the grounding strap on the SH6850 cable assembly.
7. Install the new bracket by aligning the bracket with the holes in your MIO board and screw
in the two mounting screws.
Now you are ready to connect the SH6850 shielded cable to a 50-pin MIO board and a 68-pin
accessory.
SH6850 Connection
Figure 5 illustrates how to connect the SH6850 shielded cable to a 50-pin MIO board and a 68pin MIO accessory.
Grounding Strap
SH6850
Shielded Cable
50-Pin MIO Board 68-Pin Accessory
Figure 5. 50-Pin MIO Board Connection
1. Install your MIO board in a slot in your computer, following the instructions in your MIO
board user manual.
2. Connect the 50-pin female connector (the end with the grounding strap) of the SH6850
shielded cable to the 50-pin male I/O connector of the MIO board, as shown in Figure 5.
3. Slide the end lug of the ground strap onto the tab of the MIO board bracket as shown in
Figure 5.
4. Connect the 68-pin connector of the SH6850 shielded cable to your 68-pin MIO accessory.
The 3 in. 50-to-50-pin ribbon cable is not needed when connecting a 50-pin MIO board to a 68pin MIO accessory.
SH6850 Pin Designations
The following table lists the pin designations for the 50-pin and the 68-pin I/O connectors on the
SH6850 and the corresponding MIO-16 Series and MIO-16E Series signal names.
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50-Pin Connector
Pin Numbers
1, 2 AIGND AIGND 24, 27, 29, 32, 56,
3 ACH0 ACH0 68
4 ACH8 ACH8 34
5 ACH1 ACH1 33
6 ACH9 ACH9 66
7 ACH2 ACH2 65
8 ACH10 ACH10 31
9 ACH3 ACH3 30
10 ACH11 ACH11 63
11 ACH4 ACH4 28
12 ACH12 ACH12 61
13 ACH5 ACH5 60
14 ACH13 ACH13 26
15 ACH6 ACH6 25
16 ACH14 ACH14 58
17 ACH7 ACH7 57
18 ACH15 ACH15 23
19 AISENSE AISENSE 62
20 DAC0 DAC0OUT 22
21 DAC1 DAC1OUT 21
22 EXTREF EXTREF 20
23 AOGND AOGND 54, 55
24, 33 DGND DGND 4, 7, 9, 12, 13, 15, 18, 35,
25 ADIO0 DIO0 52
26 BDIO0 DIO4 19
27 ADIO1 DIO1 17
28 BDIO1 DIO5 51
29 ADIO2 DIO2 49
30 BDIO2 DIO6 16
31 ADIO3 DIO3 47
32 BDIO3 DIO7 48
34, 35 +5V +5V 8, 14
36 SCANCLK SCANCLK 46
37 EXTSTROBE* EXTSTROBE* 45
38 EXTTRIG*/STARTTRIG* PFI0/TRIG1 11
39 EXTGATE*/ STOPTRIG PFI1/TRIG2 10
40 EXTCONV* PFI2/CONVERT* 43
41 SOURCE1 PFI3/GPCTR1_SOURCE 42
42 GATE1 PFI4/GPCTR1_GATE 41
43 OUT1 GPCTR1_OUT 40
44 EXTTMRTRIG*/ SOURCE2 PFI5/UPDATE* 6
45 GATE2 PFI6/WFTRIG 5
46 OUT2 PFI7/STARTSCAN 38
47 SOURCE5 PFI8/GPCTR0_SOURCE 37
48 GATE5 PFI9/GPCTR0_GATE 3
49 OUT5 GPCTR0_OUT 2
50 FOUT FREQ_OUT 1
MIO-16 Series
Signal Names
MIO-16E Series
Signal Names
68-Pin Connector
Pin Numbers
59, 64, 67
36, 39, 44, 50, 53
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