2: SIGNAL CONNECTION
2.1 CONNECTOR DIAGRAM
The analog connector is a 37-pin, D-type connector accessible from the rear of
the PC through the expansion backplate (Figure 2-1).
The connector accepts female 37 D-type connectors, such as those on the
C73FF-2, 2 foot cable with connectors.
If frequent changes to signal connections or signal conditioning is required,
please refer to the information on the CIO-TERMINAL and CIO-MINI37
screw terminal boards, CIO-EXP32, 32 channels analog MUX/AMP. Isolation
amplifiers can be mounted using the ISO-RACK08 and 5B isolation modules.
2.2 DIFFERENTIAL INPUTS
Differential inputs are 3-wire analog hookups consisting of a signal high, signal
low and chassis ground. The benefits of differential inputs are the ability to
reject noise which affects both signal high and low, and the ability to
compensate for ground loops or potentials between signal low and chassis
ground.
Figure 2-1. Analog Connector
Although differential inputs are often preferable to single ended inputs, there are occasions when the floating nature of a
differential input can confound attempts to make a reading. In those cases, the inputs can be converted to modified differential.
Examine the diagram of the CIO-DAS08-PGx board. Near the 37-pin connector is located a position for an optional Single Inline
Package (SIP) of resistors. Installing the SIP converts the analog inputs from fully differential to modified differential with a
resistive reference to ground. A SIP resistor network is included with the board for this purpose.
NOTE:
When using the CIO-DAS08-PGx with the CIO-EXP16 or CIO-EXP32, the optional SIP resistor must be
installed. The CIO-EXP16 and CIO-EXP32 (and MetraByte EXP16) were designed to interface to a single-ended input.
Failure to install the SIP resistor when the board is used with these expansion boards will result in floating, unstable
readings.
Special instructions and solder are packaged with the SIP resistor. Follow the installation instructions carefully
and use the solder provided. Use of any other solder, or failure to follow instructions can result in a degradation
of the analog input's accuracy and may require out-of-warranty repair
.
2.3 DIGITAL OUTPUTS & INPUTS
All the digital outputs inputs on the CIO-DAS08-PGx are TTL level. TTL is an electronics industry term, short for Transistor
Transistor Logic, with describes a standard for digital signals which are either at 0V or 5V.
4
37 CH0 HIGH
36 CH1 HIGH
35 CH2 HIGH
34 CH3 HIGH
33 CH4 HIGH
32 CH5 HIGH
31 CH6 HIGH
30 CH7 HIGH
29 +5 VOLTS
28 DIG GND
27 DIGITAL IN 3
26 DIGITAL IN 2
25 DIGITAL IN 1
24 INTERRUPT INPUT
23 GATE 2
22 GATE 1
21 GATE 0
20 -15V FROM DC/DC
CH0 LO 19
CH1 LO 18
CH2 LO 17
CH3 LO 16
CH4 LO 15
CH5 LO 14
CH6 LO 13
CH7 LO 12
LLGND 11
DIGITAL OUT 4 10
DIGITAL OUT 3 9
DIGITAL OUT 2 8
DIGITAL OUT 1 7
COUNTER 2 OUT 6
COUNTER 1 OUT 5
COUNTER 1 IN 4
COUNTER 0 OUT 3
COUNTER 0 IN 2
+15 FROM DC/DC 1
(17 pages)
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