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Digital Input / Output Relay Interface
Wiring connection
The following describes a connection example of Digital Input / Output Relay Interface.
CAUTION
If an inductive load (relay coil) or a bulb is connected, a surge voltage or rush current will be generated. Take adequate
measures against surge voltage or rush current.
Shield earthing
• The RS-485 communication cable must be earthed on Smart BMS Manager. It does not have to be earthed on
Digital Input / Output Relay Interface. The shielded wire must be crimped with closed end connector. The
shielded wire end must be insulated and left open.
Connection of external digital inputs
• Input circuit examples are shown below (electrically isolated using a photo-coupler).
(1) Example of contact input connection
12 V
+
DI-1 to DI-8
-
CAUTION
• Output sink current has polarity.
When they are connected to inappropriate input terminal, the unit may not operate properly.
Connection of external digital outputs
• Output circuit examples are shown below (open collector output electrically isolated using a photocoupler).
(1) Example of load connection
12 V
Output terminal
DO1 to DO4
GND
Input terminal
Contact
Load
Power
supply
(2) Example of contact input connection
12 V
DI-1 to DI-8
(2) Example of load connection
12 V
+12 V
Output terminal
DO1 to DO4
– 6 –
Installation Manual
Input terminal
+
Current sink
-
EN
6-EN
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