rz命令用不了？

服务器正在运行centos，已经反复安装了几次lrzsz， 但是输入rz本地窗口没有出现命令，而是打印出来waiting to receive.为什么还有一串不明其意的字符？

[root@iZ28dqmn6k8Z ~]# yum list installed lrzsz

Loaded plugins: security

Repository base is listed more than once in the configuration

Repository updates is listed more than once in the configuration

Repository extras is listed more than once in the configuration

Repository centosplus is listed more than once in the configuration

Repository contrib is listed more than once in the configuration

atomic | 2.2 kB 00:00

atomic/primary_db | 810 kB 00:54

base | 1.1 kB 00:00

epel | 3.6 kB 00:00

epel/primary_db | 2.5 MB 00:02

extras | 2.1 kB 00:00

updates | 1.9 kB 00:00

updates/primary_db | 609 kB 00:00

Installed Packages

lrzsz.i386 0.12.20-22.1 installed

[root@iZ28dqmn6k8Z ~]# rz

?**B0100000023be50e.**B0100000023be50