A&D GF-30K Instruction Manual page 82

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
the key, will be performed.
RE-ZERO
Accessory
Connector :
Foot switch :
Balance side
DCE
Inside of balance
key or
PRINT
AX-HDB-25P/CTF
AX-SW128
Connector
AX-HDB-25P
Connector cover
AX-HDB-CTF
Foot switch
AX-SW128
Balance
side
80
Computer side
DTE
Terminals sample
Example of foot switch
key
PRINT
key
RE-ZERO