S registers for the Line Link 144e


S0	Auto-answer
	Range 		Default

	0-255 rings	0		This register determines the 
						number to rings the modem will 
						count before automatically 	
						answering a call.  A value of 0 will 
						prevent the modem from 	
						answering.  Values from 1 thru 
						255 are the number of rings the 
						modem will count before 	
						answering.  The default value is 0.

S1	Count Incoming Rings
	Range		Default

	0-255 rings	43		This register counts the number of 
						incoming rings.  When the value in 
						this register equals the value in 
						Register S0, the modem answers.  
						This register resets approximately 
						8 seconds after the last ring.

S2	Escape Character
	Range		Default

	0-127 ASCII	43		Register S2 sets the ASCII value of 
						the escape characters, used to 
						switch the modem from Data 
						Mode to Command Mode without 
						losing the connection to the 	
						remote modem.  Values greater 
						than 127 disable the escape 
						feature, preventing a return to the 
						Command Mode.  If the modem 
						will be used to automatically 
						answer incoming calls, either 
						disable the escape characters of 
						set them to a value other than 
						that used by the originating 
						modem.  To return to Command 
						Mode with the escape characters 
						disabled, the remote modem must 
						hang up or an ON-to-OFF 	
						transition of the DTR interface 
						signal must occur with the &D1, 
						&D2, or &D3 command in effect.

S3	Carriage return character.
	Range 		Default	

	0-127 ASCII	13		Register S3 sets the ASCII value of 
						the carriage return (end-of-line) 
						character.  This is the character 
						used to end the command line 
						(and have the modem execute the 
						line) and also the character that 
						appears after the modem sends a 
						response.

S4	Line feed character.
	Range 		Default

	0-127 ASCII	10		Register S4 sets the ASCII value of 
						the line feed character.  The 
						modem sends the  line feed 	
						character after a carriage return 
						only when word responds are sent 
						(v1command in effect).  If a line 
						feed characters is not 		
						wanted,change the register value 
						to a null character ( the line feed 
						character cannot be totally 	
						disabled).








S5 Backspace character.
	Range		Default

	0-32, 127 ASCII	8		Register S5 sets the ASCII value of 
						the backspace character.  This 
						character is both the character 
						created by pressing the Backspace 
						key and the character echoed to 
						move the cursor to the left.  To 
						change the register value, assign 
						an ASCII value between 0 and 32, 
						or greater than 127.  Do not use 
						values between 33 and 126 since 
						they correspond to printable 
						ASCII characters.

S6	Wait for dial tone.
	Range		Default

	2-255 seconds	2		When the modem executes a Dial 
						command line with the X0, X1, or 
						X3 response set in effect, Register 
						S6 tells the modem how long to 
						wait after going off hook before it 
						dials the first digit in the Dial 
						command line.  This feature is 
						convenient when it takes linger 
						than two seconds to obtain a dial 
						tone.  If the modem does not 
						detect a dial tone when the tome 
						in Register S6 elapses, you will 
						receive the NO DIALTONE (or 6) 
						response.

S7	Wait time for carrier.
	Range 		Default

	1-60 seconds	40		Register S7 tells the modem how 
						many seconds to wait for a remote 
						modem's carrier signal before 
						hanging up.  the register value can 
						be increased if the modem does 
						not detect a carrier within the 
						specified time.  If the modem 
						detects a remote carrier signal 
						within the specified time, it sends 
						a CONNECT response and enters 
						Data Mode.  If it does not detect a 
						remote carrier signal within the 
						specified time, it sends the NO 
						CARRIER (or 3) response, hangs up 
						and returns to the Command 
						Mode.

S8	Pause time for comma.
	Range 		Default

	0-255 seconds	2		Register S8 tells the modem how 
						many seconds to pause for each 
						comma (,) it encounters in a Dial 
						command line.  The comma is used 
						when dialing through a PBX or 
						other special telephone service to 
						wait for an outside telephone line.  
						An alternative to changing this 
						register value is to include more 
						than one comma in your command 
						line.

S9	Carrier Detect response time.
	Range 		Default

	1-255		06		Register S9 tells the modem how 
	1/10 seconds			long the remote modem's carrier 
						signal must be present so the 
						modem does not mistake the 
						signal for a busy signal, ring, or 
						voice.  The factory setting requires 
						the modem to listen to the carrier 
						signal for at least 0.6 		
						seconds before recognizing it.  
						Increasing the time in this register 
						reduces the chances that the 
						modem will mistake noise such as 
						a busy signal or voice for a carrier 
						signal.  For example, entering a 
						value 15 means that the remote 
						modem's carrier signal must be 
						present for 1.5 seconds for the 
						modem to recognize it.

S10 	Carrier loss time.
	Range 		Default

	1-255		14		Register S10 sets the time 	
	1/10 seconds			between the loss of a remote 
						modem's carrier signal and when 
						the modem disconnects.  This 
						allows the remote modem's carrier 
						signal to momentarily disappear 
						from the telephone line without 
						the modem disconnecting.  the 
						factory setting can be changed to a 
						higher value when a noisy 	
						telephone line that might interfere 
						with the remote modem's carrier 
						signal.  To have the modem ignore 
						the Data Carrier Detect status and 
						act as if the remote modem' s 
						carrier signal is always present, 
						set the value to 255.  Assigning a 
						value smaller than the value in 
						Register S9 causes the modem to 
						disconnect when it detects a 
						momentary carrier less, because 
						Register S10 expires before the 
						carrier response time expires.


S-Register					Description
S11	Range		Default
	
	50-255 ms	75		Register S11 controls the speed of 
						the Touch-Tone (DTMF) dialing.  
						Increasing the register value to 
						255 slows the dialing rate to 1.9 
						digits per second.  Do not select a 
						value less than 50 milliseconds.  
						(Register S11 has no effect on 
						pulse dialing, which is fixed at 10 
						pulses per second.)

S12	Return to data mode timer.
	Range		Default

	0-255 1/50 seconds	40	Register S12 controls the time 
						delay before typing the escape 
						characters.  Register S12 controls 
						the time before returning to data 
						mode after receiving escape 
						characters unless "AT" command 
						is received.

S14	Functions
	Range 		Default
	Bit Mapped	170		Register S14 is a bit-mapped 
						register and provides the 	
						following functions (equivalent 
						commands are shown in 	
						parentheses):

				Bit 0&2	Bit0	Bit2	AT Command
						0	0	Q0
						0	1	Q1
						1	0	Q2

				Bit 1	Echo commands to DTE
					0	Do not echo commands (E0)
					1	Echo commands (E1)

				Bit 3	Word or number responses
					0	Send number responses (V0)
					1	Send word responses (V1)

				Bit 4	0	Accept commands
					1 	Ignore commands
	
				Bit 5	Dialing method
					0	Touch-Tone (T)
					1	Pulse (P)

				Bit 6	Reserved c

				Bit 7	Answer/originate operation
					0	Answer (A and R)
					1	Originate (D)

S23	Test functions
	Range 		Default

	Bit Mapped	007		Register S23 is a bit-mapped 
						register and provides the 	
						following test functions 	
						(equivalent commands are shown 
						in parentheses):

			Bit 0		Response to remote modem request for 
					Remote Digital Loopback Test
					0 	Ignore request (&T5)
					1	Grant request (&T4)

			Bits1, 2, 3 	DTE speed
					3	2	1
    					0	0	0
					0	0	1	300 bit/s
					0	1	0	1200 bit/s
					0	1	1	2400 bit/s
					1	0	0	4800 bit/s
					1	0	1	9600 bit/s
					1	1	0	19.200 bit/s
					1	1	1	38,400 bit/s

			Bits 4,5	Parity setting
					5	4
					0	0	Even parity
					0	1	Space parity
					1	0	Odd parity
					1	1	mark parity

			Bits 6,7	Guard tones	
					7	6
					0	0	Guard tones disabled (&G0)
					0	1	550 Hz guard tone (&G1)
					1	0	1800 Hz guard tone(&G2)
					1	1	Reserved

S25	DTR Delay.
	Range		Default

	0-255 seconds	5		If the &M1 command is in effect, 
						Register S25 specifies the number 
						of seconds that the modem waits 
						after a connection has been made 
						before examining the DTR lead.  
						This delay allows a asynchronous 
						terminal to be detached from the 
						modem and a synchronous 	
						terminal connection while 	
						remaining in the Data Mode.  After 
						this delay S25 reverts to 	
						hundredths of seconds.

S26	RTS/CTS Delay
	Range		Default

	0-255 hundreds   001	Sync Mode only.  Register S2                           
	of seconds				specifies the time in hundreds
						of second increments, of the 
						delay between RTS and the CTS 
						response.	

S27	Test Function
	Bit mapped		49H	Register S27 is a bit-mapped 
					register and provides the following test 
					functions (equivalent commands are 
					shown in parentheses):	

				Bit 0,1,3	Communication operation	
3	1	0
0	0	0	<M>Asynchronous operation (&M0,&Q0)
0	0	1 	Synchronous operation after dialing (&M1, &Q1)
0	1	0	Synchronous terminal support (&M2, &Q2)
0	1	1	Manually originate synchronous call (&M3, &Q3)
1	0	0	Not valid
1	0	1	Asynchronous error control (&Q5)
1	1	0	Aysnchronous buffered mode (&Q6)
1	1	1	not valid	
				Bit 2		0 Dial up line (&L0)
						1 Leased line (&L1)
				
				Bit 3		Reserved

				Bit 4,5 	Synchronous timing selection
5	4
0	0	Modem provides synchronous transmit clock on EIA pin 
		15 (&X0)
0	1	Modem accepts external synchronous clock (&X1)
1	0	receive clock (slave timing) (&X2)

				Bit 6 & 7	Bit 6	Bit7	AT Command
				0		0			B0
				1	  	0			B1
				0		1			B2
				1		1			B3

S30	Automatic Timeout.
	Range		Default	Register S30 specifies the number 
	0-255		0		of seconds the modem waits 
						without activity, before 	
						disconnecting.  Timing is in 10 
						second increments.










S36	Negotiation Faltback
	Range		Default
	
	0-7			7		When the initial attempt to 	
						connect in error-control mode 
						fails, S36 specifies what should 
						occur next.

						0	Hang up
						1	Attempt a direct 	
							asynchronous connection 
							(&Q0)
						2	
						3	Attempt an asynchronous 
							connection using automatic 
							speed buffering (&q6).
						4	Attempt a CCITT V.42 
							Alternative POrotocol 	
							connection (MNP 2-4); if 
							negotiation fails, hang up.

						5	Attempt a CCITT V.42 
							Alternative Protocol 	
							connection (MNP  ); if 	
							negotiation fails, attempt a 
							direct asynchronous 	
							connection.
						6
						7	Attempt a CCITT V.42 
							Alternative Protocol 	
							connection (MNP 	
							compatible); if negotiation 
							fails, attempt an 	
							asynchronous connection 
							using automatic speed 
							buffering.

Note: The selected fallback option can be initiated immediately with 
S48.  For example, a connection attempt using the MNP can be forced 
by setting S48=128 and S36=5 or 7.



S37	Maximum DCE Line Speed

						S37 selects the speed (for all 
						modes except CCITT V.24bis) at 
						which the modem attempts to 
						connect with a remote modem; the 
						speed selected will be the highest 
						DCE speed supported by both 
						modems (see S93 for CCITT 	
						V.25bis modes).

						0 	Speed of last AT command 
							issued
						1	75 bps
						2	110 bps
						3	300 bps
						5	1200 bps
						6	2400 bps
						7	4800 bps
						8	7200 bps
						9	9600 bps
					       	10	12000 bps
						11	14400 bps

S38 	Delay Before Forced Hangup

	Range 		Default

	0-255		20		S38 specifies the number of 
						seconds the modem waits when in 
						error-control mode (&Q5) before 
						disconnecting after receiving the 
						command to hang up or an on-to-
						off transition of DTR.  The range 
						for this register is 0-255 seconds; 
						the default to 20 seconds.  If the 
						register is set to 0, the modem 
						does not wait for data in the 
						buffers to clear (gives NO CARRIER 
						response).  If the register is set to 
						a value between 0 and 254, the 
						modem will wait the number of 
						seconds, or until all data has been 
						transferred, before hanging up.  
						(If data clears gives of response, if 
						not gives NO CARRIER response).  
						If the register is set to 255, the 
						modem will not hang up until all 
						data is transferred.

S39	ATN Command Bit Map
					Bit 5	Bit 4	Bit 3	AT Command
					0	0	0	N0
					0	0	1	N1
					0	1	0	N2
					0	1	1	N3
					1	0	0	N4
					1	0	1	N5

S46	Compression Error Control protocol Selection
	Range		Default

	136,138		138		Register S46 enables d
						13   No compression
						138 Compression

48	Feature Negotiation Action
	Range		Default

	0, 7, 128		7		Register S48 defines whether 
						feature negotiation is to be 	
						performed by the modem.  The 
						feature negotiation process allows 
						the modem at ascertain the 	
						remote system's capabilities.  If 
						these capabilities are already 
						known and negotiation is not 
						necessary, this feature can be 
						bypassed.

						0 	Negotiation disabled.   
							Modem assumes the remote 
							modem is configured 	
							properly to make a 	
							connection, bypasses the 
							detection and negotiation 
							phases, and proceeds with 
							the protocol selected by 
							Register S46.
						3	Reserved
						7	Negotiation enabled.
						128	Negotiation disabled.  Forces 
							immediate fallback as 
							specified in Register S36.  
							Can be used to force the 
							V.42 alternative protocol 
							(compatible with MNP), 
							bypassing the detection and 
							negotiation phases.

S49	Buffer Lower Limit
	Range		Default

	0-255		10		S49 specifies the minimum size of 
						the buffer used in error-control or 
						automatic speed buffering mode.  
						The range is 1-255 bytes; the 
						default setting is 10.

S50	Buffer Upper Limit
	Range		Default

	0-255		200		S50 specifies the maximum size of 
						the buffer used in error-control of 
						automatic speed buffering mode.  
						The range is 2-255 bytes; the 
						default setting is 200.

S63	Private Circuit Carrier Level
	Range 		Default

	0-15			0		S63 specifies the carrier power 
						level in dBm for leased line 	
						operation.  This register specifies a 
						carrier level value that is not to be 
						exceeded.  The range of this 
						register is 0-15 (0 to - 15 dBm).  
						The default setting is 0.

S82	Beak Signaling Technique
	Range		Default

	3, 7, 128		128		S82 selects a method of break 
						signal handling for CCITT V.42 
						communications: in sequence, 
						expedited, and destructive.  Break 
						signals provide a way to get the 
						attention of the remote host.  The 
						break type used depends on the 
						application.

						3	Expedited signaling used 
							regardless of sequence in 
							transmitted and received 
							data; data integrity 	
							maintained.

						7	Destructive signaling used 
							regardless of sequence of 
							transmitted and received 
							data; data in process at time 
							is destroyed.

						128	In sequence signaling used 
							as data is transmitted and 
							received; data integrity 
							maintained ahead of and 
							after break.



S86	Connection Failure Cause Code
	Range		Default	

	0, 4-15		None		S86 helps determine the cause of 
						a connection failure.  When the 
						modem issues a NO CARRIER 
						result code, a value is written to 
						this S-register.  To read this 
						register following the connection 
						failure, issue ATS86? <CR>.  The 
						modem will report one of the 
						values below.

						0	Normal hang up; no error 
							occurred.
						4	Physical carrier loss.
						5	Feature negotiation failed to 
							detect presence of another 
							error-control modem at the 
							other end.
						6	Other error-control modem 
							did not respond to feature 
							negotiation message sent by 
							this modem.
						7	Other modem is sychronous-
							only; this modem is 	
							asynchronous-only.
						8	Modems could not find a 
							common framing technique.
						9	Modems could not find a 
							protocol in common.
						10	Incorrect feature negotiation 
							message sent by other 
							modem.
						11	Synchronous information 
							(data of flags) not received 
							from other modem.  Modem 
							waited 30 seconds before 
							hanging up.
						12	Normal disconnect initiated 
							by other modem.
						13	Other modem did not 	
							respond after many 	
							transmissions of the same 
							message.  modem made 10 
							attempts then hung up.
						14	Protocol violation occurred.
						15	Compression failure.

Note: Multiple occurences may contribute to a NO CARRIER message; 
S86 records the first event that occurred.


                         gardless of sequence in 
							transmitted and received 
							data; data integrity 	
							maintained.

						7	Destructive
