Table of Contents
Advertisement
10.5 Local Network Installation
Read first the explanations in Section 6.2.4.
10.5.1 Installing an RS-485 Local Network Link between Hydran 201 Tis or
between 201 Ci Controllers
A local network is a chain of Hydran 201Ti, Hydran 201i Systems and/or Hydran 201R
Model i's in which the Hydran 201Ti or the 201Ci Controllers are connected together
using an RS-485 link. If the installation includes only one Hydran 201Ti, Hydran 201i
System or Hydran 201R Model i, go to Section 10.5.2.
Proceed as follows:
1. Run an RS-485 cable from one H201Ti or H201Ci to the next in a conduit to form a
chain. Use instrumentation-grade cables (twisted triad with overall shield);
otherwise use armored cables.
Note: The total maximum length for all RS-485 link cables in a local network is 1,200 m
(4,000 ft).
CAUTION
2. Connect the RS-485 cables into the main terminal block. For wiring details, see
Appendix D.
Note: In an RS-485 link pin 1 is always connected to pin 1, pin 2 to pin 2, pin 3 to pin 3.
Except for the two H201Cis located at each end of a local network, two RS-485 link cables
are attached to each H201Ci using the Main Terminal Block. Powering down one H201Ci
does not affect the local network or the other H201Cis.
CAUTION
CAUTION
Page 152
The shield of each cable section must be grounded at one end
only.
The shield of each cable section must be grounded at one end
only. Routing and shielding of the RS-485 cable is particularly
important because all H201Cis belonging to a network share a
common reference with this link.
The operation of the complete H201Ci network may be affected
if wires are not connected correctly. Be careful when installing
and inserting each wire. Be sure to insert all strands in the
terminal; strands that touch two terminals cause problems. Do
not leave trims of metallic strands inside the H201Ci's
enclosure.
Hydran* 201i Instruction Manual
MA-033
Rev. 14.0, 12-Nov-18
Advertisement
Table of Contents
