Black Box DB-9 To RJ-45 Adapter

Black BoxSKU: 2889648

Price:
Sale price$123.73

Description

An essential solution for legacy serial setups, the Black Box DB-9 To RJ-45 Adapter delivers seamless RS-232 to RS-422 connectivity with a simple, passive design. This compact adapter features a DB9 female RS-232 connector on one end and an RJ-45 connector on the other, allowing direct connection to RS-232 equipment while interfacing with RS-422 devices that use RJ-45 wiring. No power supply is required because the adapter draws its operating power from the RS-232 data and control signals, making it ideal for portable laboratories, field deployments, and equipment racks where extra power cables and adapters would complicate the setup. With handshaking signals looped back, this adapter preserves essential RS-232 control behavior, ensuring reliable communication in a variety of industrial and engineering environments.

  • Direct, passive RS-232 to RS-422 connection: The DB9 female RS-232 port pairs with an RJ-45 RS-422 interface, enabling straightforward wiring between legacy equipment and modern RS-422 devices without active electronics or external power.
  • No external power required: Designed to be drawn entirely from RS-232 data and control signals, this adapter eliminates the need for a power supply, batteries, or additional cabling in tight workspaces or portable deployments.
  • Handshake signal loopback for compatibility: All RS-232 handshaking signals are looped back through the adapter to maintain expected control line behavior, helping ensure reliable data flow with devices that rely on RTS/CTS, DTR/DSR, and other handshake lines.
  • 4-wire operation with full duplex: The interface supports 4-wire RS-232 operation and full-duplex communication, enabling simultaneous two-way data transmission essential for real-time control and monitoring applications.
  • Compact, robust design for field use: Built to endure the rigors of on-site testing and installation, this adapter provides a dependable, low-profile solution whenever RS-232 to RS-422 wiring is required.

Technical Details of Black Box DB-9 To RJ-45 Adapter

  • RS-232 connector: DB9 female
  • RS-422 connector: RJ-45
  • Power requirements: None; power is drawn from RS-232 data and control signals
  • Handshake behavior: Loops back all RS-232 handshaking signals
  • Interface operation: 4-wire RS-232 operation, full duplex

How to install Black Box DB-9 To RJ-45 Adapter

  • Identify the RS-232 device’s DB9 port and connect the adapter’s DB9 female end firmly to it, ensuring the connector aligns with the port and locks into place if a locking mechanism is present.
  • Connect the RJ-45 side of the adapter to the RS-422 device or to the equipment that requires the RJ-45 interface, using a suitable RJ-45 cable rated for your application’s environment and distance.
  • Power on both devices and verify that RS-232 and RS-422 devices initialize correctly. Because the adapter is passive, there is no separate power step required.
  • Confirm communication by testing a simple data exchange or loopback test, paying particular attention to whether control lines (RTS/CTS, DTR/DSR) appear to be functioning as expected due to the loopback behavior.
  • Position the cable and adapter away from excessive heat, moisture, or EMI sources to maintain signal integrity, and secure cables to prevent accidental disconnections in busy equipment racks or field setups.

Frequently asked questions

  • Q: What does the Black Box DB-9 To RJ-45 Adapter do?
    A: It provides a passive, power-free interface to connect RS-232 devices with a DB9 female connector to RS-422 equipment using an RJ-45 connector, enabling straightforward serial connectivity without active electronics.
  • Q: Does this adapter require an external power source?
    A: No. The adapter draws operating power from the RS-232 data and control signals, and it does not need a separate power supply.
  • Q: How does handshaking work with this adapter?
    A: The adapter loops back all RS-232 handshaking signals, preserving control line behavior to maintain compatibility with devices that rely on RTS/CTS, DTR/DSR, and similar signals.
  • Q: Is it suitable for full-duplex communication?
    A: Yes. The adapter supports 4-wire operation and full-duplex RS-232 communication, allowing simultaneous two-way data transmission between connected equipment.
  • Q: Where is this adapter most useful?
    A: It’s ideal for labs, test benches, field deployments, and equipment racks where RS-232 to RS-422 wiring is needed without adding power supplies or complex electronics. It’s particularly handy when digitizing or interfacing legacy devices with modern RS-422 peripherals via RJ-45 connections.

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