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351 Ferrier Street • Markham, ON • L3R 5Z2
PHONE: 416-410-6865 TOLL FREE: 1-866-331-3341 • FAX: 905-752-0186
www.watchnetaccess.com / [email protected]
2.4 RS485 Net Bus
The WAC 1D2T MICRO can communicate via half-duplex RS485 bus and up to a 1200m communication
distance. Terminals use series connection.
Please make sure power supply is in off state before wiring. This helps to avoid any damage that might
be 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
WAC 1D2T MICRO TCP/IP network
Figure 2-8
120
Ω
