Advantech PCM-3601 user manual AT Commands, Prefix, Repeat and Escape Commands, Operation Commands

Chapter 4

AT Commands

This chapter describes the basic modem commands in alphabetical order. Some commands have factory default settings, for which you can refer to your Getting Started manual Command Summary table.

4.1Prefix, Repeat and Escape Commands

AT Attention. Precede all command lines except A/ and +++

A/ Re-execute the last command in command buffer

+++Escape characters, requires guard time before and after

4.2Dial Commands and Dial Modifiers

DOriginate a call

S=n Dial the nth stored number

TTouch tone dialing P Pulse dialing

R Dial in answer mode

WWait for second dial tone L Re-Dial the last valid

telephone number

,Pause ! Flash

; Return to command state

4.3Operation Commands

A	Answer incoming call	M2	detected
B0	CCITT or ITU-T compatibility		Speaker always on
		N0	Fixed data rate follow *N
B1	Bell protocol only
			command
E0	Disable command echo
		N1	Enable adaptive data rate
E1	Enable echo command
		O0	Return to data-link without
	characters
			retrain
H0	Hang up the connection (on-	O1
			Return to data-link with
	hook)
H1			retrain
	Go off-hook to make a call
		Q0	Modem sends response
I0	Reports product code
			codes
I1	Calculates the ROM	Q1
			Do not send response codes
	checksum
I3		Sr?	Display the value in register
	Reports firmware version
		Sr=n	Set register r to a value n
L0	Low volume
		V0	Display response codes in
L1	Low volume
L2	Medium volume		digit form
L3	High volume	V1	Display response codes in
			words
M0	Speaker off at all times
		W0	Disable V.42 response codes,
M1	Speaker on until CD

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