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AT Register Summary (continued)
Command
Description
Range
Unit
Default
S13
Reserved
S14
Option register
None
AAH
(see below)
S15
Reserved
S16
Self-test register
S17
Reserved
S18
Self-test timer value
S19
Reserved
S20
Reserved
S21
Option register
None
00H
(see below)
S22
Option register
None
76H
(see below)
S23
Option register
None
07H
(see below)
S24
Reserved
S25
DTR delay value
0-255
1/100 sec
005
S26
RTS to CTS turnaround delay
S27
Option register
None
40H
(see below)
S37
MNP modem line connect
speed
Fax/Modem
B-9