Connecting A Host Computer To A Hydran 201Ci Controller In A Local Network, Using An Rs-232 Cable; Verifying Rs-232 And Rs-485 Communications; Table 9-2 - Wiring For Serial Cables - GE Hydran 201 i Instruction Manual

Chapter 9 • Communications and Networking
9.5.2 Connecting a Host Computer to a Hydran 201Ci Controller in a Local
Network, Using an RS-232 Cable
The supplied RS-232 cable (1.8 m [6 ft]) can be connected to any H201Ci in a local
network to allow a host computer to communicate with all H201Ci's and Hydran 201Ti's
in the network.
The RS-232 cable can be used as is; in the case of a permanent installation, you can also
use a commercial null-modem cable (Rx and Tx wires are crossed) with female DB-9
connectors at both ends. Cut and splice the cable in order to be able to run it into the conduit
fitting. These cables are available in lengths up to 7.7 m (25 ft).
The length of an RS-232 communication cable must not exceed 7.7 m
WARNING
CAUTION
(25 ft).
You can also make your own null-modem cable by using the same type of cable as for the
RS-485 link. Wire the female DB-9 connector as shown in Table 9-2 on page 9-10.
From the Hydran 201Ci Controller
Female DB-9 connector, pin 2
Female DB-9 connector, pin 3
Female DB-9 connector, pin 5
The shield of each cable section must be grounded at one end only.
WARNING
CAUTION
Ensure the H201Ci and the host computer share a common earth
ground. Otherwise, use short-haul (private line) modem to provide
electrical isolation between them.
9.5.3

Verifying RS-232 and RS-485 Communications

Proceed as described in Section 7.2.3 on page 7-4.
9-10

Table 9-2 - Wiring for Serial Cables

Rev. 6, March 2011
To the Host Computer
Female DB-9 connector, pin 3
Female DB-9 connector, pin 2
Female DB-9 connector, pin 5
Part 17997