
NOVA541
- 28 -
(2) Retransmission (RET)
2-4-4
Digital output and input
▶ RELAY : Normal Open 30VDC 1A max, 250VAC 1A max.
▶ Use a mechanical contactor (non-voltage type) as relay for the digital input (DI).
▶ The relay for DI must have sufficient on-off repeatability at 5V open voltage and 1 mA short
circuit current.
▶ The open collector for DI should have low ON state voltage (<2V) and low leakage current less
than 100μA at OFF state.
External RELAY contact
TRANSISTOR Input contact
4~20mA DC, 500Ω max
Receiver
(recorder)
DI_1
DI_2
DI_COM
+5V
DI_1
DI_2
DI_COM
RLY_NO
RLY_NO
RLY_COM
RLY_COM
RLY_NO
RLY_NO
RLY_NO
RLY_COM
+
-
Ground
SHIELD