Hydran* 201i Instruction Manual
MA-033 Rev. 14.0, 12-Nov-18
10.5.2 Connecting a Host Computer to a Hydran 201Ci Controller in a
Local Network, using an RS-485 Cable
The supplied USB cable 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. A
RS-232 cable can also be used to allow the host computer to communicate with all
H201Ci’s and Hydran 201Ti’s in the network.
The USB cable can be used or an RS-232 cable can be used as well; in the case of a
permanent installation with the RS-232 cable, 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 7.7m (25ft).
The length of an RS-232 communication cable must not exceed
7.7m (25ft). For the length of a USB communication cable, it
cannot exceed 5m (16.4ft).
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 10-2 below.
From the Hydran 201Ci Controller
Female DB 9 Connector pin 2
Female DB 9 Connector pin 3
Female DB 9 Connector pin 3
Female DB 9 Connector pin 2
Female DB 9 Connector pin 5
Female DB 9 Connector pin 5
Table 10-2: Wiring for Serial Cable
The shield of each cable section must be grounded at one end
only. 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.
10.5.3 Verifying RS-232 or USB and RS-485 Communications
Proceed as described in Section 8.2.3.
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