For serial communications, General Electric Canada uses its own custom
protocol. Data is transmitted in ASCII codes; data clusters being transmitted are
verified and, if necessary, transmitted again. This ensures compatibility with the
Hydran 201i System.
5.2 Installing a Network
An installation checklist is supplied in Appendix B.
5.2.1 Installing the RS-485 Network Link
Note: For information on the recommended type of cable and for wiring details,
see Section D-1.
Proceed as follows:
1. Run the RS-485 cables through a conduit, from one Hydran M2-X to the next,
to form a daisy chain.
Note: For notes and procedures regarding conduits, see Section 4.3.9. The total
maximum length for all RS-485 cables in a network is 1,200 m (4,000 ft).
2. Ground each conduit at the extremity at which the RS-485 cable is connected
to the RS-485 In terminals. See the Figure below. A conduit is grounded by
connecting it to terminal 12 of the RS-485 terminal block.
Figure 5-5: Grounding the RS-485 Conduits
3. Isolate from the Hydran M2-X the conduit extremity at which the RS-485
cable is connected to the RS-485 Out terminals. See Figure 5-5 above. Follow
the company regulations.
4. Ensure all wires are identified at both ends.
5. Connect the wires to the RS-485 terminal blocks.
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