A&D MC Series Instruction Manual page 46

RS-232C Terminals
External contact input
By connecting pin 18 (PRINT command) to pin 7, or pin 19 (RE-ZERO command) to pin 7 for 100 ms
or more, the same operation as performed by pressing the PRINT key or the RE-ZERO key, will be
performed.
Option
Connector :
Foot switch :
Balance side
DCE
Inside of balance
Example of foot switch
AX-HDB-25P/CTF
AX-SW128
Balance side
44
Computer side
DTE
Terminals sample
Connector
AX-HDB-25P
Connector cover
AX-HDB-CTF
Foot switch
AX-SW128
PRINT key
RE-ZERO key