2 rs-485 multi unit / in line example, Rs-485 multi unit / in line example – Campbell Scientific SDM-SIO1 Serial Input/Output Module User Manual

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SDM-SIO1 Serial Input/Output Module

3.3.2 RS-485 Multi Unit / In Line Example

1 C1

RS-485 0V for ground referencing

3 C3

logger

4 G

5 +12V

6 G

RS-485_0V

7 RX-A

RS-485_Y

8 CTS-B

RS-485_Z

9 RTS-Y

RS-485_A

10 TX-Z

RS-485_B

First RS-485
equipment

11 0V

RS-485

12 Z

RS-485_B

13 Y

RS-485_A

14 B

RS-485_Z

15 A

RS-485_Y

Second RS-485
equipment

As with all RS-485 configurations the use of termination
resistors is optional. They tend not to be required with shorter
cable runs and with modern slew-rate limited driver technology
(as used in the SDM-SIO1).

NOTE