Installation Example (For 2-Wire Rs-485 Application) - TC Communications TC1540 User Manual

Installation Example (for 2-wire RS-485 application)

Figure 11 depicts a typical 2-wire RS-485 application. The host controller polls the status of the remote RTU
through a 2-wire RS-485 bus. Once the remote RTU receives the polling message, it answers with a response
signal. The communication is half-duplex: the polling device and responding RTU take turns transmitting.
Electrical Interface:
Data Rate:
Optic Redundancy:
DIP Switch settings:
LEDs to observe:
SW1-4 is off and master TC2100 is in OPERATION mode
2-wire RS-485
9600 Baud (Async)
Utilized
SW1, SW2, SW3, SW4, SW5, SW7 and SW8 to Left; SW6 to Right (on both
units)
Local & remote unit's "TxD" and "RxD" LEDs should flash in an alternating
pattern (due to half-duplex communication)
2-wire RS-485 Quick Installation
(local & remote Units)
Figure 11. 2-Wire RS-485 Installation Diagram
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TC1540D User's Manual
Rev. 1.2