与电脑串口连接正常,但好象速度较慢,用超级终端可以连接上,输入help后出现一些命令......不解其义

内容:
cmd:help
commands are case insensitive
use backspace key (bs) for correction
use the disp command to display all options
insert jumper j4 and connect gps for aprs operation
remove jumper j4 and connect to terminal for command interpreter
commands (with example):
mycall (mycall wb8wga-2)
upproto (unproto wb8wga-14 v wb8wga-1) - 3 digis max
btext (btext bob)-100 chars max
beacon (beacon every n)- n=0 is off and 1<n<60 mins
monitor (mon all,mon me, or mon off)
digipeat (digi on or digi off)
myalias (myalias relay)
perm (perm)
echo (echo on or echo off)
gps (gps $gpgga or gps $gpgll or gps $gprmc)
trace (tr xmit or tr rcv) - for debugging only
txdelay (txdelay n 0<n<201 n is number of delay flags to send)
calibrate (calibrate mode - testing only)
cmd: disp
echo on
txdelay 10
gps $gpgga
trace off
monitor all
digipeater on
beacon off
unproto
mycall bg6qbt-0
myalias
btext