
MULTI GAUGE CONTROLLER
COMMUNICATION
COMMUNICATION
. INTRODUCTION
This chapter is intended for users who want to use Modbus RTU, Modbus TCP (Ethernet) or op-
tionally Pro iNet communication links. These are communication protocols used to control the
functioning of the MG .
The following chapter includes general information about standards, wiring and electrical connec-
tions. It presents the connectors and wiring for serial links RS
, RS
(Modbus RTU protocols),
Ethernet (Modbus TCP) and optionally Pro iNet (Modbus RTU).
In addition, it includes advances issues, such as access to full resolution of loating point data and
user interface permissions.
. .
CABLE SELECTION
This section includes general information about types of cables that should be used in the serial
communication system.
It is recommended that the digital communication network cable have the following electrical pa-
rameters:
• Rated DC resistance should be max.
Ω/km. Generally . mm ( AWG) cables or thicker.
• Rated impedance
Ω at
kHz.
• With differential communication screened twisted pair should be used.
• Mutual capacitance of a pair should be max.
pF/m (capacitance between two conductors
in a pair).
• Stray capacitance max.
pF/m (capacitance between one conductor and all other con-
nected with ground).
Of course, selection of a cable entails compromise between costs and quality of the cable (damping
or quality of screening). For applications in an environment with high likelihood of occurrence high
levels of electrical interference it is recommended to use a cable with copper screen and ground it.
For long-distance communication use a cable with low damping.
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