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RSCOM2D: RS232 to RS422, RS232 to RS485 (using RTS)
and TTL/CMOS to RS232/RS422/RS485 converter


RSCOM2D with Box


"Let me spin a very large
RS485 network for you!"

  • Very flexible interface converter for RS232, RS422 (4-wire, full-duplex), RS485 (2-wire, half-duplex), and TTL/CMOS applications.

  • CFast Async interface converter for point-to-point (or multi-drop communications using RTS or TTL/CMOS control), at distances up to 4000 ft. and data rates up to 115.2Kbps.

General Description:

The RSCOM2D is an Async bi-directional RS232 to RS485/RS422 interface converter for 4-wire RS485/RS422 applications (full-duplex point-to-point) or, by using the RTS (request to send) control line the unit can be configured as a 2-wire half-duplex converter (See RSCOM2A for automatic TX enable). The unit has fixed light bias on the RS485/RS422 receiver, jumper selectable termination, RS232 DTE/DCE selection, and operating mode settings. The unit has 3 edge mounted LED indicators, a screw terminal connector, and built-in transient protection. While the RSCOM2D is primarily used in 4-wire applications, the flexibility built into the unit allows for many other special applications as well. The unit will operate at speeds up to 115.2Kbps.

The RSCOM2D is designed for office and/or industrial applications (non-isolated), and is used primarily for 4-wire full-duplex, point-to-point applications (remote sign control, RS232 "extension core"); however, 33 on-board jumper settings provide a wide range of possible configurations to solve many communications problems.

Need something special? Please contact us. We have additional isolated and non-isolated converters, repeaters, and repeater hubs. Units are generally stock to 2-3 business days for shipment. We design and manufacturer our entire product line, and offer technical support for our units, and can offer system recommendations for your application. Please give us a call: 513-874-4796

Related Files:

PDF Icon
Converter schematic/physical Rev. B

Physical Properties and Features:

RS232 3-wire interface to DB9M Connector (TX, RX, Common)
RS485 Screw terminals (Common, TX+, RX-, RX+, TX-, Common, Vin)
Power Screw terminals
LEDs Edge mounted Power(YEL), TX-RS485(RED), RX-RS485(GRN)
Bias Fixed light bias on RS485/RS422 Receiver
Termination 120 Ohm (jumper selectable)
Special Flexible jumper selectable configurations and TTL/CMOS interface
Protection Dual P6KE6.8A Transient Voltage Suppressors inside 1N4004 diode bridge circuit, on RS485/RS422 TX and RX data lines


Distance RS485/RS422 up to 4000 ft. (1250 meters)
Operation 2-wire, half-duplex RS485 or 4-wire, full-duplex RS485/RS422
Format Asynchronous data with any combination of bits, parity, stop
Speed Up to 115.2Kbps (slew limited driver)
Temperature 0-65C (32-150F) ambient
Humidity 10-90% non-condensing
Voltage 9-35VDC, switching regulator
Power Under 1/2 Watt (typical) + external load
Size 3.75" X 2.75" X 0.9" (PC Board), with connectors: 3.75" X 3.00"
Mounting 4-Holes 3.00" X 2.25" (built-in standoffs for #6 hardware)

Options and Ordering Information:

RSCOM2D $89.00 ea. (Circuit board only)
Enclosure $12.00 ea. (Medium-Din)
Cable No cable available for this product (DB9M onboard)
Supply $8.50 ea. (12VDC @ 200/300 mA wall power supply)

*RSCOM2D with all options: RSCOM2D-BSPS @ $109.50 ea. (Qty. 1-9)

Need a different configuration or more information? Give Ron a Call at 513-874-4796 or 513-638-0228(Cell)

Webstore: RSCOM2D

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