3Com MSR 50, MSR 30 manual Sendat command can issue only one AT command at a time

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sendat

Syntax	sendat at-string
View	Interface view (The interface can be an asynchronous serial interface, a
	asynchronous/synchronous serial interface operating in the asynchronous mode,
	an AUX interface, or an AM interface.)
Parameter	at-string: AT command string. This argument can contain “+++”, “A/” or any
	string beginning with AT.
	For detailed description of AT commands, see Table 80
Description	Use the sendat command to send AT command to modem manually.
	The sendat command sends strings to modem as AT commands without checking
	whether or not the strings are valid commands. The characters that are in
	lowercase in the string are converted to the corresponding uppercase characters
	automatically.
	If debugging for modem is enabled on the interface, the result code returned by
	modem is displayed. If you specify to display the executed commands, The AT
	commands executed are displayed as well.
n	■ To accept AT commands from the modem, you must first put the modem in AT
	command mode. So sending commands in transmitting mode is invalid.
	■ The sendat command can issue only one AT command at a time.
	■ After Modem is configured with the AT command, its operating state might be
	changed, thus affecting the functions such as dialup. Please use this function
	with caution under the guidance of technicians.
	Table 80 Description on common AT commands
	Command	Description
	AT	Commands used to configure a modem, except A/ (Repeat Last
		Command) and +++ (Escape Code), begin with AT. AT informs the
		modem that commands are being sent to it. If you execute the AT
		command only, the modem returns OK or 0, which indicates that it is
		ready to accept commands.
	A	Use A command to enable a modem to answer an incoming call
		without waiting for the ringing. You can use this command when you
		configure to answer an incoming call manually or the modem is
		configured to connect to another modem in actively. All the commands
		following the A command in the same command line are ignored.