ATOM RS485 DC/DC Voltage Converter at 4800bps

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Hi,
I'm developing a device to output NMEA0183 strings on an RS485 interface. Everything is working, except when I try to initialize the serial port for the RS485 interface to 4800, it does not start (not available).

Serial2.begin(4800, SERIAL_8N1, 22, 19);

If I initialize it at 9600, it works fine
Serial2.begin(9600, SERIAL_8N1, 22, 19);

Does anyone have any suggestions on what I might try?