GE Hydran 201i, Instruction Manual

Page: 73 / 300

Part 17997 Rev. 6, March 2011 4-1
Chapter 4
Hydran 201T i ’s Displays and Menus
Note: It is recommended to use the Hydran Host software rather than the H201Ti’s user
interface (keypad and display). See the Hydran Host Software Manual.
All parameters and commands that can be accessed with the H201T i ’s user interface can
also be accessed with the Hydran Host software, except for the analog inputs/outputs
calibration and the communication parameters. The first power-up (see Section 4.2.5 on
page 4-6) must also be performed using the H201T
i ’s keypad.
4.1 USER INTERFACE
The Hydran 201T i ’s user interface is located on the front of the CPU module (item 4 in
Figure 2-2 on page 2-5). It consists of the following (see Figure 4-1 on page 4-2):
• An alphanumeric LCD display, consisting of two lines of 16 characters. It requires no
manual contrast adjustment and is equipped with temperature compensation. When the
H201T
i is closed, the display remains visible through a window in the aluminum cover.
Note: Make a shadow over the display and observe the backlighting. Although it appears
dim in daylight, the backlight allows easy reading of the display at night. The contrast of
this thermally-compensated display is set automatically; it can thus operate over the full
temperature range of the H201Ti and is perfectly readable under all ambient lighting
conditions. At low temperatures, the LCD display might not be legible, but all other
functionalities are fully operational.
• A six-key keypad (see Section 4.3 on page 4-7), also designed to function under an
extremely wide temperature range.
The H201T i ’s user interface has three main functions:
• First priority : To display all unacknowledged alarm messages requiring an action from
the user. This task corresponds to the Unacknowledged Alarms mode (Section 4.2.1 on
page 4-3).