Specifications

SDM-SIO1 Serial Input/Output Module

3.3.2 RS-485 Multi Unit / In Line Example

1 C1

2 C2 RS-485 0V for ground referencing

3 C3 To 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 0V

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