The Model 2025 is designed to plug directly into an RS-232 device with a DB-25 serial port. The Model 2029 plugs directly into an EIA-574 (RS-232) device with a DB-9 serial port. Both come equipped with a six foot cable. And both models use microprocessor technology to automatically orient themselves for serial-to-parallel or parallel-to-serial data conversion. A single LED indicator monitors five modes, including transmit status.
If you need to convert a DB-9 Serial port to Parallel or vice versa, you need the Patton Model 2029