Communications & Networking; Communications For Hydran 201R Model I Or Hydran 201I System, Using A Supervisory Link - GE Hydran 201i Instruction Manual

Hydran* 201i Instruction Manual
10 COMMUNICATIONS & NETWORKING
There are many possible configurations of Hydran 201Ti Intelligent Transmitters:
• It can be used alone.
• It can be combined with a Hydran 201Ci-1 One-Channel Controller (see
Section 4.2) to form a Hydran 201R Model i.
• From one to four H201Ti's can be combined with a Hydran 201Ci-C
Communications Controller (see Section 4.1) to form a Hydran 201i System.
The following Sections describe:
• Communications within a Hydran 201R Model i or a Hydran 201i System, using
a supervisory link: See Section 10.1.
• Communications in a network, using an RS-485 local network link: See Section
10.2.
• Communications with a host computer, using an RS-232 or USB serial
communication link: See Section 10.3.
• Communication protocol: See Section 10.4.
• Installation of a local network: See Section 10.5.
• Installation of an optional modem: See Section 10.5.
10.1 Communications for Hydran 201R Model i or Hydran 201i
System, Using a Supervisory Link
In a Hydran 201R Model i or a Hydran 201i System, each Hydran 201Ti is linked to its
Hydran 201Ci 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 H201Ci
must not exceed 1,200m (4,000ft).
• 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).
- One shielded pair to transmit serial communications.
- For the Hydran 201Ci-1 only: One shielded pair for the TDM (time division
multiplexing) signal transmitted by the H201Ti (see Section 10.1.1).
• Each supervisory link is electrically isolated and protected (2,000V RMS
optocouplers, gas arresters, capacitors and tranzorbs) to withstand at both
ends (H201Ti and H201Ci) surges up to 2,000V RMS as well as the large noise
transients and ground potential differences typically found in electrical
substations.
• Bidirectional data communication is transparently passed by the H201Ci
between the supervisory link port, the RS-485 LAN connector and the RS-232
Computer Port or USB connector. The communication path is half-duplex (one
direction at a time, from a single talker).
The supervisory link cable can be connected at the following locations:
MA-033 Rev. 14.0, 12-Nov-18
Page 143