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How can I configure my Sealevel SeaPORT Plus 2203 USB to Serial Adapter?

1Answers
Ruiz
12/17/2025, 07:17:25 AM

To configure your Sealevel SeaPORT Plus 2203 USB to 2-Port Serial Interface Adapter for your specific needs, follow these steps:

  1. Open the Device: Start by removing the four screws located on the bottom of the device to access the internal components.
  2. Adjust DIP Switches: The SeaPORT Plus 2203 allows you to individually configure each port for RS-232, RS-422, or RS-485 interfaces using DIP switches and DIP shunts. Here's how to interpret the switch settings:
    • L 485 Option: Controls 485 operation, OFF for 422.
      • OFF: No effect.
      • ON: Connects TX+ to RX+ for two-wire operation.
    • L 485 Option: Controls 485 operation, OFF for 422.
      • OFF: No effect.
      • ON: Connects TX- to RX- for two-wire operation.
    • PU 485 Option: Controls 485 operation, OFF for 422.
      • OFF: No effect.
      • ON: Adds a 1 K ohm pull-up resistor to RX+.
    • PD 485 Option: Controls 485 operation, OFF for 422.
      • OFF: No effect.
      • ON: Adds a 1 K ohm pull-down resistor to RX-.
    • T 422 and 485 Option: Controls termination for 422/485.
      • OFF: No effect.
      • ON: Adds a 120-ohm termination resistor between RX+ and RX-.
  3. Switch Examples for Modes:
    • 485 Mode Selection:
      • OFF (422 Mode): The transmitter lines TX+ and TX- are always driven.
      • ON (485 Mode): The transmitter lines TX+ and TX- are switched to high impedance when the device is not actively transmitting data.
  4. Electrical Interface Selection: Each port can be configured independently using shunts. The shunt positions determine the interface type:
    • Port RS-232: Place the corresponding shunt in the 232 positions; the switches will have no effect.
    • Port 2 RS-485 (two-wire, no echo): Position the corresponding shunt in the 422/485 position. Ensure that switches 485 2, NE 2, and Port 2 L, L, T, PU, and PD are all in the ON position.
  5. Reassemble the Adapter: When you're done configuring the settings, reassemble the device, ensuring the top and bottom halves align correctly.

By following these steps, you can successfully configure your Sealevel SeaPORT Plus 2203 to fit your specific application requirements.

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