Linux串口软件c-kermit配置和使用问题？

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Linux串口软件c-kermit配置和使用问题？

应用环境：PC 虚拟机 redhat Linux(2.6.18-53.el5) gcc(4.1.2) arm-linun-gcc(4.3.2)

安装：
下载tar包：columbia.edu/kermit          /ftp/archives/cku302.tar.gz
tar zxvf cku302.tar.gz -C kermit
cd kermit
make linux
cp wermit /usr/bin
cp wart /usr/bin


配置
# vi ~/.kermrc
输入：
set line          /dev/ttyUSB0
set speed         115200
set carrier-watch off
set handshake     none
set flow-control none
robust
set file type     bin
set file name     lit
set rec pack      1000
set send pack     1000
set window        5
c


使用：
[root@localhost /]# wermit
Locked by process 13625
?SET SPEED has no effect without prior SET LINE
Sorry, you must SET LINE or SET HOST first
C-Kermit 9.0.302 OPEN SOURCE:, 20 Aug 2011, for Linux
Copyright (C) 1985, 2011,
  Trustees of Columbia University in the City of New York.
Type ? or HELP for help.
(/) C-Kermit>connect
Sorry, you must SET LINE or SET HOST first
(/) C-Kermit>

这是怎么回事？如何解决？