CHAPTER 41
Connection cables
405.1200.037.2 - Rel.: 2.21 of 25/02/2008
41-4
All VTs communicate with other devices using serial port communication.
In this chapter you will find information on all the cables used to connect
with various devices together with their order codes.
Those cables marked NOT CODED are not supplied by ESA
elettronica but listed here nonetheless to make it easier for the
user to make them.
General notes
Serial communications are highly susceptible to disturbances, so, in order
to limit as much as possible the influence of these disturbances good quality
shielded cables must be used.
The table below lists the characteristics of the cable to be used for serial
connection.
Particular care should be taken in the choice and lay-out of cables,
specially with regard to the VT <-> Device connection serial cable.
Always:
• Find the shortest route
• Lay disturbed cables separately
Disconnect the power supply before connecting or disconnecting
the communication cables so as to avoid possible damage to the
VT and/or the connected device.
Specifications of serial connection cable
Direct current resistance
Max. 151 Ohm/Km
Capacity coupling
Max. 29pF/m
Shielding
> 80% or total
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