Chapter 4. WIRING
●
3-wire system RS-485 connection diagram
Attach 1/2W or greater terminating resistances of 150
Ω
±5% at each end of the commu-
nications lines. Ground the shield FGs at one end in one location, not at both ends.
When only three RS-485 terminals are provided, the areas designated with an asterisk
(*) are connected internally.
HANDLING PRECAUTIONS
• Be sure to connect SG terminals each other. Failure to do so might cause
unstable communications.
*
,+2##
,+2##
,+2##
*
4-15