Bi-Directional Communication, RS-485 [1204-0B]

• Inputs/Outputs: Bi-directional Communication Port
• Signal Type and Connector: Balanced RS-485 (3.8 mm terminal block)
• Maximum Number of Cards: 1
• Ordering Information: 1204-0B: RS-485 Communications Module

Model 1204-0B option card rear plate

Model 1204-0B: RS-485 pin-out

Pin Assignments
Pin No.	Signal
1	GND
2	RS-485 IN+
3	RS-485 IN-
4	GND
5	RS485 OUT+
6	RS485 OUT-
7	GND
8	NC
9	NC
10	NC

Once an address has been assigned, the communication port can be operated as input or output (via CLI).

Communication Input/Output: Edit Window

To configure the Communication port’s settings, go to its Edit window. For instructions, see: Configuring Option Card Inputs/Outputs.

The Web UI list entry for this card is: RS-485 Comm.

The name of the Input/Output is: RS-485 Comm [number].

Note: SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz outputs start at 1, because of the built-in outputs).

The Edit window allows the configuration of the following settings:

• RS-485 Address: [0-31]

Communication Input/Output: Status Window

To view the address of an RS-485 communication input/output, go to its Status window. For instructions, see: Viewing Input/Output Configuration Settings.

The Web UI list entry for this card is: RS-485 Comm.

The name of the Input/Output is: RS-485 Comm [number].

Note: SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz outputs start at 1, because of the built-in outputs).

The Status window displays the following settings:

• RS-485 Address: [0-31]