Martel Electronics DMC1410 - Manual (Page 68)

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Up to 5 characters may be entered for a unit description using a
telephone style entry method. The four lower lines provide a
mapping of the allowed alphanumeric characters to the numeric
keypad keys. To enter a character press the corresponding numeric
key multiple times to cycle through the mapped characters until the
desired character is displayed. For example, to enter E, press the 8
key 3 times. If the next character is on a different numeric key,
simply press that key to advance the cursor and display the first
mapped character. If the next character is on the same key, press
ENTER to advance the cursor before pressing the same key. To
insert a space, press ENTER twice. To erase characters press CE.
Press the DONE function key when the unit description is complete.
Optional Setup - Manual Input or Output on Lower Display
If either manual type is selected on the lower display, the lower
manual unit description prompt is displayed. Except for the title on
the first line, it looks like and operates identically to the upper display
version described in the previous paragraph.
Optional Setup - Pressure on Upper or Lower Display
If pressure is selected on the upper or lower display, a pressure zero
prompt is displayed. Note that this prompt is displayed again before
each adjustment or subsequent test. If the installed module is not an
absolute pressure module, the following prompt is displayed.
The value displayed on the top line is the current pressure reading
adjusted with the current zero value. Press the ZERO function key to
zero the pressure, or if satisfied with the current zero press the
DONE function key to bypass changing it. When satisfied with the
pressure zero, press the DONE function key to continue.
If the installed module is an absolute pressure module, the following
prompt is displayed.