plink can not work with serial port

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hello everybody
please accept my apologize if this topic is not related to this group.
i want to connect to modem via serial port by plink. when i run the below
command, every thing is ok and modem answer me correctly.

putty -v -serial -sercfg 8,1,115200,n,R /dev/ttyu2

but when i run the below command, i receive no respond from modem.

plink -v -serial -sercfg 8,1,115200,n,R /dev/ttyu2

please let me know what's wrong here and why plink can not connect to modem.

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