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DLM4000 User Guide
PN 161-09997-003A
Feb 2005
DLM4000 Registers
Sn?:
This will allow viewing of the register value. Here is an example of how to read register S7.
ATS7?.
Sn=:
This will allow modification of the register value. Here is an example of how to change register S7. ATS7=130.
S0:
This register determines the number of rings before the modem will answer a call. When S0
is set to 0 the modem will not auto-answer calls.
Range: 0-255
Unit: Ring
S1:
This register counts the number of rings on the line when a modem is set to auto-answer.
The register is cleared 8 seconds after the last ring.
S2:
This register stores the decimal ASCII value of the escape character. The default value is 43 which is a +.
Range: 0-127
Unit: ASCII
Default: 43
S3:
Stores the decimal ASCII value of the carriage return character, which terminates both the command line and the
response code.
Range: 0-127
Unit: ASCII
Default: 13
S4:
This register stores the decimal ASCII value of the line feed character, which follows a carriage return after a
response code is sent.
Range: 0-127 Unit: ASCII
Default: 10
S5:
This register stores the decimal ASCII value of the backspace character, which is used as the backspace key for
editing and as the character echoed to move the cursor backwards on the screen.
Range: 0-32
Unit: ASCII
Default: 8
S6:
Determines how long the modem waits after off-hook before it proceeds to dial. This delay allows the central office
to detect the off-hook status of the line and apply a dial tone. If this is set too short this may not allow a call to go
through. This register is valid only when X0, X1, or X3 is in effect. If X2 or X4 is in effect, the dial tone detection is
enabled and the modem will not blind-dial.
Range: 2-255 Unit: Second
Default: 2
S7:
Determines how long the modem will wait for a remote carrier signal after it dials or answers.
Range: 1-255
Unit: Second
Default: 30
S8:
Determines pause time for a comma.
Range: 0-255 Unit: Second
Default: 2
S9:
Determines how long a carrier signal must continuously exist before it is recognized as a valid signal by the
DLM4000. A longer time gives DLM4000 time to distinguish the carrier signal from noise.
Range: 1-255
Unit: .1 Sec.
Default: 6
S10:
Determines how long the DLM4000 will wait before hanging up after it detects a loss of carrier. This delay permits
the carrier to momentarily disappear without causing the modem to disconnect. If this register is set to 255, the
modem ignores carrier status as though a carrier was always present. S10 should be set to a value larger than S9.
Range: 1-255
Unit .1 Sec.
Default: 14
