Rice Lake MC Series Mass Comparator, A&D Weighing - MC-6100 - Manual (Page 46)

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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 : AX-HDB-25P/CTF
Foot switch : AX-SW128
Balance side
DCE
Computer side
DTE
Inside of balance Terminals sample
Balance side
PRINT key
RE-ZERO key
Connector
AX-HDB-25P
Connector cover
AX-HDB-CTF
Foot switch
AX-SW128
Example of foot switch