English French German Italian Japanese Korean Spanish
RS-232 to x.21 interface converter product photo

Features / Benefits

  • RS-232 to X.21 Interface Converter
  • Interface - RS-232 and X.21, DB-25 Male and X.21 Male /Female Genders
  • Data Rates - Synchronous to 128Kbps
  • Line Powered
  • 6 Foot Cable Included
  • Passes All Appropriate Control Signals
  • Bi-Directional Transmission
  • Transparent to Data
  • Compact and Easy To Install


The 232-X21 is a RS-232 to X.21 Interface Converter and is designed to provide signal level conversion between RS-232 DCE (Modem) equipment and X.21 DTE (Terminal) equipment.

The 232-X21 transmits data bi-directionally at data rates up to 128kbps. The device has no switches or straps to configure.

Ideal for Local Area and Wide Area networks the 232-X21 interface converter is line powered and requires No AC power source.

Utilizing new silicon chip technology this device requires less than 7ma for operation. This equates to savings in your power requirements and with battery backup at your data center.

Applications that can benefit from the 232-X21 are LAN-WAN connectivety, video conferencing, Adaptation of older model test equipment and new high speed Modems connecting to X.21 DTE equipment.

The 232-X21 is protocol independent and passes all appropriate Data, Clock and Control Signals.

For maximum flexibility to your system requirement, the 232-X21 is available in Male or Female X.21 genders.

The 232-X21 is housed in a sturdy metal enclosure and will provide in excess of 100,000 hours of reliable service.

The 232-X21 has a three year warranty and a 24 hour turnaround on warranty repairs.

rs232 to x.21 interface converter network diagram


Application RS-232 to X.21 Interface and Signal Level Conversion
Capacity One DCE RS-232 and one X.21 Sync DTE device
Interface RS-232 and X.21 Male or Female connectors
Data Format Data transparent at all data rates
Data Rates Up to 128Kbps
Switches None
RS-232 Physical Interface Male DB-25 Connector
X.21 Physical Interface Female or Male DB-15 Connector
Power Source Line Powered from existing equipment - Draws 10ma - No AC power required
Environmental Operating Temperature..32º to 122º F (0º to 50º C)
Relative Humidity...........5 to 95% Non-Condensing
Altitude.........................0 to 10,000 feet
Dimensions Height ....... 0.50 inches (1.27 cm)

Width ........ 1.75 inches (4.44 cm)

Length ....... 1.75 inches (4.44 cm)

Weight 1/2 pound (0.228Kg), Includes Cable and Shipping Box
Warranty Three Years, Return To Factory
Ordering Information Model: 232-X21 M/F
Description: RS-232 to X.21 Converter, Male DB-25 and Female DB-15

Model: 232-X21 M/M
Description: RS-232 to X.21 Converter, Male DB-25 and Male DB-15

Included with each unit: unit: 1) Installation Guide

2) 6 foot cable