Embedded board with 4 X RS232 + 4 x 10Bits ADC + 16 x Digital I/O

For a control application I'm looking for an embedded board and SW
development environment with the following specs
4 X RS232 capable of running upto 115200 Bauds
4 x 10Bits ADC
16 x general purpose digital I/O
Weight < 150grams

Main function of the SW application as follows
Read serial data packet (SDP1) from Serial Port 1 (SP1)
Read SDP2 from SP2
Read SDP3 from SP3 (this is input port only)
Read SDP3 from SP4 (this is input port only)
Send data SDP1 to SP2
Send data SDP2, SDP3 and SDP4 to SP1
Send data from ADC1, ADC2, ADC3,ADC4 to SP1

* Serial data packet (SDP1) consist of a header byte + packet ID byte +
packet length + data + CRC
* Data rates are variable


Any recommendation ?


Samuel




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