Embedded Solutions
Page 40
Applications Guide
I
nterfacing
The pin-out tables are displayed with the pins in the same relative order as the actual
connectors. Some general interfacing guidelines are presented below. Do not hesitate
to contact the factory if you need more assistance.
Watch the system grounds. All electrically connected equipment should have a fail-safe
common ground that is large enough to handle all current loads without affecting noise
immunity. Power supplies and power-consuming loads should all have their own ground
wires back to a common point.
Power all system power supplies from one switch. Differential interface devices provide
some immunity from, and allow operation when part of the circuit is powered on and
part is not. It is better to avoid the issue of going past the safe operating areas by
powering the equipment together and by having a good ground reference.
Keep cables short. Flat cables, even with alternate ground lines, are not suitable for
long distances. In addition series resistors are used and can be specified to be
something other than the 0 ohm standard value. The connector is pinned out for a
standard DB37 cable to be used. It is suggested that this standard cable be used for
most of the cable run or an equivalent with proper twisted pairs and shielding.
Coming Soon. Terminal Block. We offer a high quality 37 screw terminal block that
directly connects to the DB37. The terminal block can mount on standard DIN rails.
DBterm37 has an associated twisted pair cable compatible with the PCIeBiSerialDB37.
[
http://www.dyneng.com/DBterm68.html
]
We provide the components. You provide the system. Safety and reliability can be
achieved only by careful planning and practice. Inputs can be damaged by static
discharge, or by applying voltage outside of the particular device’s rated voltages.