Advertisement
1 Communications Methods
1-1-5
Wiring
RS-485
• The RS-485 connection can be either one-to-one or one-to-N. Up to 32 units including the host
can be connected in a one-to-N system.
• The total cable length is 500 m max.
• Use shielded twisted-pair cable.
For detailed wiring specifications, refer to Precautions for Safe Use on page 7.
E5CD/ED
RS-485
A < B: "1" Mark
A > B: "0" Space
Specify both ends of the transmission path including the host
as the end node (that is, connect terminating resistance to both
ends). Use a terminating resistance of at least 54 Ω.
1 - 4
Host
Abbreviation
FG
−
+
SG
Shield
E5CD/ED
RS-485
Pin
Abbreviation
14
A (−)
13
B (+)
6.8 V
Terminating
E5CD/ED
resistance
120 Ω
End node
(1/2 W)
RS-485
Pin
14
13
Shield
Use 120 Ω (1/2 W)
terminating resistance.
E5@D Digital Temperature Controllers Communications Manual (H225)
Communications
transceiver
TX
RX
Abbreviation
A (−)
B (+)
Advertisement
