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rs232 async to sync converter product photo

Features / Benefits

  • RS-232 async to sync converter
  • Interface - RS-232, DB-25 Male (To DCE) and Female (To DTE)
  • Data Rates - Synchronous to 38.4bps and supports 3/4 baud rates
  • Synchronous data rates are automatically adjusted
  • Line Powered
  • Switch selectable - 8 to 11 bits
  • Optional RTS delay circuitry
  • CCITT V.14 and V.22 compliant
  • Supports full and half duplex operation
  • Compact and Easy To Install


The ASC-232 is a RS-232 Async to Sync Converter is designed to allow async terminal equipment to transmit over higher speed sync modems. The ASC-232 devices are used in pairs, one at each end of the communication link or in multiples as when used in a multi-drop communication link. Polled network environments are supportd by utilizing the RTS holdover delay option that is switch selectable in delay times.

The ASC-232 supports async data of 8, 9, 10 and 11 bits, including the start and stop bit. Standard data rates from 1200 to 38.4bps and 3/4 rates of 900 to 28.8bps are supported for synchronous transmission. The ASC-232 automatically adjusts the sync data rate to match the DTE's output rate, no data rate strapping is required.

Stop bit reduction is provided when the async data rate is faster than the sync data rate, ensuring reliable data communications.

Utilizing new silicon chip technology this device derives its power from both the async and sync RS-232 interfaces, thus no power supply is required. This equates to savings in your power requirements and with battery backup at your data center.

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

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

async to sync converter application diagram


Application RS-232 async to sync data converter; Conversion, full or half duplex
Capacity One sync RS-232 modem; One async terminal
** Unlimited amount of site drops
Interface RS-232
Data Format Data transparent at all data rates; Conforms to CCITT V.14 and V.22, (Async to Sync conversion)
Data Rates 1200 to 38.4bps; 900 to 28.8bps
Switches Provided for async data set-up, stop bit reduction, RTS hold over and signal to frame ground
RS-232 Physical Interface Male DB-25 Connector to Modem

Female DB-25 Connector for Terminal

Power Source Line Powered from existing equipment -
Draws 8ma - 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 ....... 1.75 inches (4.44 cm)

Width ........ 7.90 inches (20.07 cm)

Length ....... 9.00 inches (22.86 cm)
Weight 1 pound (0.457Kg)
Warranty Three Years, Return To Factory
Regulatory Approvals UL 60950-1:2003, CAN/CSA-C22.2 No. 60950-1:2003FCC Part 15, EN55022:2006, ICES-003, Class A
Ordering Information Model: ASC-232
Description: Async to Sync converter
Included with each unit: 1) Installation Guide