KEYKING GROUP LIMITED
TA7003NT User Manual
（
V1.0
）
Page 11 of 29
Figure 2-6 Cathode lock
（
Fail secure
）
2.4 RS485 Net Bus
TA7003NT can communicate via half-duplex RS485 bus, up to 1200m communication distance. Terminals
use series connection.
Please make sure power supply is in off state before do wiring. This helps to avoid any damage maybe caused
to the device.
Figure 2-7
Twisted-pair
：
Twisted-pair are used to connect controller to controller. No GND is needed.
Series connection
：
Terminals are connecting via series connection. A multi-bus RS485HUB is
needed if customer needs parallel connection.
RS485 Single Point Ground
：
If controller transmission line is with shielding or needs ground
line, then all controllers
’
transmission line can be grounded in either controller. Please
note do not gather all metal side to the GND of controller.
Terminal Resistance
：
Series connected at the end of the circuit.
2.5 TCP/IP Network
TA7003NT TCP/IP network
120
Ω
