Multi-Tech Systems MT5600BA-V92 manual Registers

						Chapter 6 – S-Registers
S-Reg	Unit	Range	Default	Description
S29	10 ms	0–255	70	On Hook Time: Sets the length of time that the modem goes on-hook when it
				encounters a flash dial modifier (!) in the dialing string.
S30	10 seconds	0, 1–255	0	Disonnect Inactivity Timer: Sets the length of time that the modem waits before
				disconnecting when no data is sent or received. A value of zero disables the timer.
				Applies to asynchronous operation only.
S36	decimal	0–7	7	LAPM Failure Control: Specifies the fallback action to take in the event of an
				LAPM negotiation failure. These fallback options are initiated immediately upon
				connection if S48 is set to 128. If an invalid number is entered, S36 acts as if the
				default value has been entered. (See S48.)
				0		Modem disconnects.
				1	Modem stays online and a direct mode connection is established.
				3	Modem stays on-line; normal mode connection established.
				4	MNP connection is attempted. If it fails, modem disconnects.
				5	MNP connection is attempted. If it fails, a direct mode connection is established.
				7	An MNP connection is attempted and if it fails, a normal modem connection is
						established.
S38	seconds	0–254,	20	Delay Before Forced Hang Up: Sets the delay between the modem’s receipt of
		255		the H command to disconnect (or high-to-low transition of DTR if the modem is
				programmed to follow the signal) and the disconnect operation. Applies only to
				error-correction connections. This register can be used to ensure that data in the
				modem buffer is sent before the modem disconnects. If S38 is set between 0 and
				254, the modem waits for the remote modem to acknowledge all data in the buffer
				before disconnecting. IfS38 is set to 255, the modem does not time out and
				continues to attempt to deliver data in the buffer until the connection is lost or the
				data is delivered.
S46	decimal	136,	138	Data Compression Control: Enables/disables data compression:
		138		136 Error correction without compression.138 Error correction with compression.
S48	decimal	0, 7,	7	V.42 Negotiation Control: Enables or disables LAPM negotiation.
		128		An invalid value is treated as a 128 value.
				0		Disables negotiation and proceeds with LAPM.
				7		Enables negotiation.
				128		Disables negotiation. Proceeds at once with the fallback action specified in
						S36. Can be used to force MNP.
S86	decimal	0, 3–23	n/a	Call Failure Reason Code: When the modem issues a NO CARRIER result code,
				a value is written to this register to help determine the reason for the failed
				connection. S86 records the first event that contributes to a NO CARRIER
				message. Use the S86? command to read the value.
				0		Normal disconnect; no error occurred.
				3		Call Waiting caused disconnect.
				4		Physical loss of carrier.
				5		No error correction at the other end.
				6		No response to feature negotiation.
				7		This modem is async-only, the other sync-only.
				8		No framing technique in common.
				9		No protocol in common.
				10		Bad response to feature negotiation.
				11		No sync information from remote modem.
				12		Normal disconnect initiated by remote modem.
				13		Remote modem doesn’t respond after 10 retransmissions of the message.
				14		Protocol violation.
				15		DTR lost.
				16		Received GSTN clear down.
				17		Inactivity timeout.
				18		Speed not supported.
				19		Long space disconnect.
				20		Key abort disconnect.
				21		Clears previous disconnect reason.
				22		No connection established.
				23		Disconnect after three retrains.
				24		Call Waiting tone detected.
				25		Extension pickup detected.
				26		Remote hang up detected.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G) 44