CR-2 Character Repeater / RS-232 Line Driver / RS-485 Converter

• Repeats RS-232, RS-422 (often named RS-485 4-wire), RS-485 data
• Drives 4 wire lines up to 5,000 feet
• Converts RS-232 to RS-485/422 4-wire or RS-485 2-wire
• Regenerates asynchronous characters to correct timing problems
• Industrial rated temperature from -40 to +70 C
• Two asynchronous serial ports
• RS232, RS422, or RS485 2-wire or 4-wire
• Ports speeds to 57.6 Kbps
• Works in Point-to-point and multipoint applications
• Easy to setup and maintain
• Configuration via serial or ethernet port
• Used to regenerate over-sampled data
• Compact size; stand-alone or rack mounting
• AC and/or DC power supply
• User name and password option for configuration security
• ROHS, CE

DESCRIPTION

The CR-2 is an industrial rated asynchronous line driver, interface converter, and character repeater.

The line driver mode is used to connect RS-232 interfaces up to 5,000 feet apart using a 4-wire link.

It regenerates asynchronous data to corrrect oversampling errors, or drive up to 5,000 feet of copper wire. The CR-2 uses UARTs in addition to RS232 and RS485 2-wire or 4-wire drivers and receivers (The CR-2 is RS422 compatible using the RS485 4-wire setting). The CR-2 regenerates both the electrical signals and the characters.

Regenerating characters is useful when back to back links that user over-sampling are tied together. For example, over sampling 19200 bps asynchronous data over a 56 kbps synchronous circuit will shorten or lengthen each 1 or 0 by up to 34%. Receiving devices will typically correctly recover the data with 34% bit length distortion. However, back to back over sampled links can add another 34% bit distortion, for a total of 68%. A bit distortion of 68% results in bit errors.

The CR-2 removes async bit distortion by regenerating the characters. Each of the bits of a character coming out of an asynchronous UART have the same time duration.

The CR-2 is shipped with both interfaces set to RS232. The user can option the CR-2 for RS422/485 4-wire operation or for RS485 2-wire operation by using the configuration menus through the console port, telnet, or web-browser configuration management features.

Questions? Phone us toll free at 800-432-2638

Due to the nature of this product,
we prefer that you phone us and discuss your application prior to ordering.