GE Hydran 201i, Instruction Manual

Page: 177 / 300

Part 17997 Rev. 6, March 2011 9-1
Chapter 9
Communications and Networking
There are many possible configurations of Hydran 201T i Intelligent Transmitters:
• It can be used alone.
• It can be combined with a Hydran 201C
i -1 One-Channel Controller (see Section 3.2 on
page 3-7) to form a Hydran 201R Model i .
• From one to four H201T i ’s can be combined with a Hydran 201C i -C Communications
Controller (see Section 3.1 on page 3-1) to form a Hydran 201 i System.
The following Sections describe:
• Communications within a Hydran 201R Model i or a Hydran 201 i System, using a
supervisory link: See Section 9.1 on page 9-1
• Communications in a network, using an RS-485 local network link: See Section 9.2 on
page 9-3
• Communications with a host computer, using an RS-232 or USB serial communication
link: See Section 9.3 on page 9-5
• Communication protocol: See Section 9.4 on page 9-8
• Installation of a local network: See Section 9.5 on page 9-8
• Installation of an optional modem: See Section 9.6 on page 9-11
9.1 COMMUNICATIONS WITHIN A HYDRAN 201R MODEL I OR A
HYDRAN 201
I
SYSTEM, USING A SUPERVISORY LINK
In a Hydran 201R Model i or a Hydran 201 i System, each Hydran 201T i is linked to its
Hydran 201C i Controller using a cable referred to as supervisory link .
Note the following points:
• The total length of all supervisory link cables connected to a single H201C i must not
exceed 1,200 m (4,000 ft).
• The supervisory link uses a four- or six-wire shielded cable:
– One shielded pair for the supervisory link’s 15-Vdc power supply (unregulated and
impedance-protected).