Networking And Communications Capabilities - GE Hydran 201i Instruction Manual

Hydran* 201i Instruction Manual
The Hydran Host software performs five basic tasks:
• A continuous, on-line survey of alarm status and basic information from one
or several H201Ti's.
• Real-time logging of information from one or several H201Ti's.
• Continuous or programmed uploading of historical data (history download)
from one or several H201Ti network(s) with graphic display.
• Downloading and uploading of configuration data (H201Ti set-up) to one or
several H201Ti's from/to the host computer.
• H201Ti embedded program upgrading of one or several H201Ti's
2.3

Networking and Communications Capabilities

Starting with the CPU FW v4.0, up to 32 Hydran 201Ti Intelligent Transmitters can be
connected in a single RS-485 network and monitored by a local computer using
computer's USB communication port. This is accomplished by connecting the 201Tis to
the computer via an RS-485 to USB converter. Such network can also be monitored
remotely from a computer via modem. In this case the PC (equipped with modem) has to
be connected to a Hydran 201 Ci-1 or Ci-C via either the USB port or the RS-232 port, and
subsequently to up to max 32 201Tis that are connected in daisy chain via RS-485 port
available in 201Ti.
Also is still offered the possibility of having up to 128 Hydran 201Ti Intelligent
Transmitters be connected in a single network and monitored and controlled by
computer (either locally or remotely through a modem) using computer's RS-232 or USB
communication port. This is accomplished by connecting groups of one to four H201Ti's
to a Hydran 201Ci-C Controller via an isolated supervisory link, and then connecting the
many H201Ci Controllers via an isolated RS-485 LAN.
Each supervisory link is isolated to a level of 2,000 V RMS, both at the H201Ti end and
at the H201Ci end. Individual transmitters can be wired directly to their group controller
if the total cable length does not exceed 1,200 m (4,000 ft).
The supervisory links and the RS-485 LAN are electrically isolated and all H201Ci's on
a network share a single reference ground. The H201Ci's are networked together in a
daisy-chain fashion. Usually, the H201Ci's are to be found in a well-defined area of a
substation (such as a control building) but the RS-485 LAN can have a total length of
1,200 m (4,000 ft) if required. For 32 H201Ci's, this gives an average distance of 40 m
(120 ft) between each H201Ci.
Although the RS-485 LAN is electrically separate from the multiple supervisory links,
the entire system forms a single logical network and each of the H201Ti's, up to a
maximum of 128, can be called by the supervisory computer using the Gas Monitor
Address of the transmitter (a user-defined number from 1 to 254 specific to each H201Ti).
When the network option to use H201Ci's is required, the supervisory computer can
be indifferently connected to the RS-232 or USB port of any of the H201Ci's since each
H201Ci automatically routes communications to and from its RS-232 or USB computer
port, isolated supervisory link port and isolated RS-485 LAN port. More than one
MA-033 Rev. 14.0, 12-Nov-18
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