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RS485 v2 baud rate

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I'm using the RS485 v2 Arduino shield and SoftwareSerial to interface with a sensor.  It communicates fine at 38400 baud, but at 57600 there are a few CRC errors and at 115200 every message has CRC errors.  The sensor has been tested with the hardware serial and it works at 115200 baud.  The communications cable is 2 feet of shielded twisted pair.  Are there any known issues with SoftwareSerial and/or the RS485 v2 shield at 115200 baud?

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