Denso BHT-8000 User Manual page 69

System Status Indication
Turning on the system status indication displays the following icons in the bottom line of the LCD:
Indication
Shift state of the keys
Alphabet entry mode
Icon Description
Appears when the keys on the keypad are shifted.
Appears when the BHT is placed in the alphabet entry
mode.
(If the alphanumeric entry system has been selected in
user programs, pressing the SF key will switch from the
numeric entry mode to alphabet entry mode.)
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Chapter 2 Getting Started the BHT and System Mode