The Hydran M2-X’s user interface (see Figure 2-2) consists of an eight-key
membrane keypad and a 128 x 64 pixels, backlit liquid crystal display (LCD) to use the
Hydran M2-X as a stand-alone unit. For more information on the user interface, see
Chapter 3.
2.3.2 Right Side – Terminal Blocks
The following connectors and terminal blocks are mounted on the right side of
the electronic card cage (when facing the display; see Figure 2-5):
Figure 2-5: Right Side of the Electronic Card Cage
1. DB-9 connector for RS-232 link: This surge-protected, male connector
allows local RS-232 communications between the Hydran M2-X and a
laptop computer running the Perception software. For details, see
Chapter 5.
2. TDM and RS-485 terminal block: This terminal block is used to connect
the following signals (from left to right; for wiring details, see Section D-1):
• Terminals 1 to 4: Standard TDM (time division multiplexing) signal. This
TDM signal is provided for backward compatibility with the Hydran
201Ti; see the Hydran 201i System Instruction Manual. This TDM signal
transmits two pieces of information:
– The percentage of gas level (where 100 % is 2,000 ppm for the
standard model).
– The state of the alarm relays 1 and 2.
• Terminals 5 to 12: RS-485 network link input and output signals. These
signals are used to connect two or more Hydran M2-X’s in a daisy
chain configuration to form a network. The network can be connected
temporarily through the DB-9 connector to a laptop computer running
the Perception software. For information on networking, see Chapter
5.
3. Two optional I/O interfaces: The following interfaces are available (any
combination is allowed):
• 4–20 mA general-purpose isolated input: The Hydran M2-X can
monitor up to four analog inputs. These analog inputs are typically
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