DAQPAD CABLE ADAPTER Thank you for purchasing the DAQPad cable adapter from National Instruments. This guide describes how to install the adapter to connect the DAQPad-MIO-16XE-50 to external accessories. The DAQPad cable adapter contains the shielded 68-pin E Series I/O connector that connects the DAQPad-MIO-16XE-50 to accessories such as the SCB-68 and the SC-2040 Series. The adapter also contains spring terminals for connection to external current excitation and a temperature sensor for cold-junction compensation with thermocouples. Figure 1 shows the DAQPad cable adapter parts locator diagram. DAQPad™ is a trademark of National Instruments Corporation. Product and company names are trademarks or trade names of their respective companies. 321318A-01 © Copyright 1996 National Instruments Corp. All rights reserved. September 1996 2 3 4 5 6 7 1 8 9 IEX- 10 IEX+ 11 12 13 Front Panel 1 2 3 4 5 Product Name +5 V Fused/F2 SPARE Fuse/F1 DAQPad-MIO-16XE-50 Connector Cold-Junction Sensor 6 SW1 IEX Switch 7 Serial Number 8 Assembly Number 9 Thumbscrew 10 11 12 13 68-Pin E Series I/O Connector Power LED Grounding Lug (Optional) Spring Terminal Figure 1. Parts Locator Diagram +5 V Fuses There are two fuses on the adapter. The fuse labeled +5 V FUSED/F2 limits the +5 V power output current. The fuse labeled SPARE FUSE/F1 is a replacement. 2 Grounding Lug If you are using a shielded cable for external current excitation, you can install a grounding lug to connect the cable shield to the chassis ground of the DAQPad-MIO-16XE-50. Two grounding lugs are included in your adapter kit; one of these is a spare. To install a lug, remove the thumbscrew nearest the spring terminals. Put the thumbscrew through the hole in the lug and reinstall the thumbscrew, as shown in Figure 1. IEX Spring Terminals The spring terminals on the front panel, IEX+ and IEX-, provide external current excitation for temperature measurements using RTDs or thermistors. IEX+ is the current output and IEX- is the current return. The constant current source provides 100 µA of external excitation. To connect to the spring terminal blocks, you can use up to 20 AWG wire with the insulation stripped to 0.5 in. Depress the orange lever using a small screwdriver, then insert the wire and release the lever. The IEX slide switch, SW1, turns external current excitation on and off. For external current excitation, push SW1 to the ON position. Figure 2 suggests how you can connect several RTDs in series to the DAQPad-MIO-16XE-50 using four-wire measurement techniques. Note: If you do not externally connect IEX+ to IEX- and you want to perform cold-junction sensor measurements, you must push the slide switch to the OFF position. 3 IEX RTD1 ON OFF IEX+ I = 100 µA RTD2 AIGND Thermistor for Cold-junction Sensing IEX- ACH<0 ..7> ACH8 Instrumentation Amplifier MIO Connector + ACH0 PGIA ACH<8 ..15> ACH15 + Measure Vm ACH7 DAQPad-MIO-16XE-50 Figure 2. RTD Connection Using External Current Excitation 4 - Voltage Pin Assignments Figure 3 shows the pin assignments of the DAQPad cable adapter. ACH8 ACH1 AIGND ACH10 ACH3 AIGND ACH4 AIGND ACH13 ACH6 AIGND ACH15 DAC0OUT DAC1OUT EXTREF DIO4 DGND DIO1 DIO6 DGND +5 V DGND DGND PFI0/TRIG1 PFI1/TRIG2 DGND +5 V DGND PFI5/UPDATE* PFI6/WFTRIG DGND PFI9/GPCTR0_GATE GPCTR0_OUT FREQ_OUT 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 ACH0 AIGND ACH9 ACH2 AIGND ACH11 AISENSE ACH12 ACH5 AIGND ACH14 ACH7 AIGND AOGND AOGND DGND DIO0 DIO5 DGND DIO2 DIO7 DIO3 SCANCLK EXTSTROBE* DGND PFI2/CONVERT* PFI3/GPCTR1_SOURCE PFI4/GPCTR1_GATE GPCTR1_OUT DGND PFI7/STARTSCAN PFI8/GPCTR0_SOURCE DGND DGND Figure 3. DAQPad Cable Adapter Pin Assignments 5 Warning: Connections that exceed any of the maximum ratings of input or output signals on the DAQPad-MIO-16XE-50 can damage the DAQPad-MIO-16XE-50 and the computer. The DAQPad-MIO-16XE-50 User Manual lists the maximum input ratings for each signal. National Instruments is NOT liable for any damages resulting from incorrect signal connections. Installation To install the DAQPad cable adapter, remove the DAQPad-TB-52 (a detachable terminal block with screw terminals) from the DAQPad-MIO-16XE-50. Slide the cable adapter into the DAQPad-MIO-16XE-50 and screw it in place using the two thumbscrews. Note: The LED on the DAQPad cable adapter lights only when the adapter is firmly connected to the DAQPad-MIO-16XE-50. DAQPad-MIO-16XE-50 DAQPad Cable Adapter Figure 4. DAQPad-MIO-16XE-50 6 Refer to your DAQPad-MIO-16XE-50 User Manual for instructions on connecting your parallel port connectors and power supply to the DAQPad-MIO-16XE-50. 7