Yamaha RCX240 User Manual page 502

3. Communication specifications
Problems caused by poor connections
1
2
AC100 to 200V
3
4
Ground wire was not at ground
potential or not connected.
5
6
7
8
9
10
8-8
Chapter 8 RS-232C INTERFACE
External device *
FG
Potential
Failure to use
ground wire might
raise the voltage
potential.
* External device: Notebook PC using an AC adapter, etc.
Improper ground wire connection
might cause electrical shock if
connector metal parts are
touched.
Connector metal parts
Malfunction or breakdown might
occur when making connection or
after connection.
RCX240