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eMBTCPInit(MB_TCP_PORT_USE_DEFAULT);
eMBInit( MB_RTU, 0x3,0, 115200, MB_PAR_EVEN);
  eMBEnable();

eMBPoll();

./modpoll -b 115200 -p even -m rtu -a 0x3 -r 1 -c 10 /dev/ttyUSB0
modpoll 3.4 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright (c) 2002-2013 proconX Pty Ltd
Visit http://www.modbusdriver.com for Modbus libraries and tools.

Protocol configuration: Modbus RTU
Slave configuration...: address = 3, start reference = 1, count = 10
Communication.........: /dev/ttyUSB0, 115200, 8, 1, even, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

-- Polling slave... (Ctrl-C to stop)
Reply time-out!
-- Polling slave... (Ctrl-C to stop)
Reply time-out!
-- Polling slave... (Ctrl-C to stop)
Reply time-out!