Null modem cable Lantronix ACC-500-164-R DB-9 F to DB-9 F, length 1.83 m

Null modem cable Lantronix ACC-500-164-R DB-9 F to DB-9 F, length 1.83 m provides a ready-made RS-232 serial connection with crossed transmit and receive lines for direct peer-to-peer communication. The cable features female DB-9 connectors on both ends and a jacketed lead long enough for typical desktop and equipment-rack setups. It is intended for situations where two DTE devices must communicate without a modem or other intermediary, using standard serial signalling.

Advantages

This Lantronix null modem cable offers straightforward, reliable RS-232 wiring that removes the need to manually rewire connectors or build adapters. The premade cross-over ensures correct TX/RX mapping for immediate use with serial ports that expect null modem wiring. Its DB-9 female connectors are compatible with many computers, industrial devices and POS terminals, and the 1.83 m length balances reach and signal integrity for short to medium runs.

Suitable for

• Direct serial communication between two computers or terminals
• Connecting POS terminals, cash registers and barcode scanners to host devices
• Linking serial-enabled industrial controllers, PLCs and instrumentation
• Testing and configuring network equipment and serial consoles

Key specifications

• Connector type: DB-9 female on both ends
• Cable wiring: null modem / TX and RX crossed for RS-232 peer-to-peer use
• Cable length: 1.83 m
• Signal standard: RS-232 serial communication
• Typical use: short to medium distance serial connections

How to use

Connect each DB-9 female connector to the corresponding 9-pin serial male port on the devices to be linked. Ensure serial port settings (baud rate, parity, data bits, stop bits, and flow control) are matched on both devices before initiating communication. The null modem wiring handles transmit/receive cross-over; no additional wiring changes are required. If using devices with external adapters or gender-changers, verify pin compatibility to preserve the null modem mapping.

Usage recommendations

For reliable operation, keep the cable run free from strong electromagnetic interference sources and avoid tight bends near the connectors. Confirm RS-232 voltage and handshake signal compatibility between devices; when hardware flow control is required, verify that both ends support the same handshake lines. Store the cable coiled loosely to prevent kinking when not in use.