SNBC BTP-R180II User Manual page 22

2) Cash drawer interface outlet uses RJ-11 6P connector.
3) Interface signal definition
Caution:
 Do not connect or disconnect signal cable when printer power is on.
 Signal cable should be far away from strong current.
 Signal cable should be far away from strong current sources.
PIN Signal Name
1 FG
2 DRAWER 1
3
DRSW
4 VDR
5 DRAWER 2
6 GND
Functions
Frame Ground
Cash drawer 1 driving signal
Cash drawer status test
signal
Cash drawer driving power
Cash drawer 2 driving signal
Circuit share ground
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BTP-R180II User's Manual