Checking Key Switches; Checking Control Input/Output; Checking Standard Serial Output - AND AD-4401A Instruction Manual

20.1. Checking Key Switches

When a key switch is pressed, "0" in the corresponding position turns to "1".

20.2. Checking Control Input/Output

When an input terminal is ON, "0" in the corresponding position turns to "1".
When the NET/GROSS key or Function key is pressed, the corresponding pin No. of the control output B1 to
B6 turns ON.
A6 A5 A4 A3 A2 A1 B1 to B6

20.3. Checking Standard Serial Output

When the ENTER key is pressed, "123" is sent. The communication specifications comply with the standard
serial output specifications.
AD-4401A Page 74