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8–17
S39 Bit-mapped register, default: 32:
S40 Bit-mapped register, default: 0:
(3) 0 0 CD tracks the carrier. (Default)
1 8 The CD on/off sequence follows the UNIX
standard. CD is turned ON before the con-
nection message is sent and CD is turned
OFF after the last DCE response is sent. (A
UNIX system needs CD ON to enable serial
port receiving.) (See &C1, S21b4.)
(2,1) Reserved.
(0) 1 1 Enables repeat dialing of the default number
if not connected. (See also *Dn, S29)
Code Bits Bin. Dec. Description
(7,6) Reserved.
(5) 1 32 Disables scrambler/descrambler in V.26bis
mode. Enables compatibility with older
V.26bis modems which have no such unit.
(4) 1 16 Class 2 fax with DTE speed shifting; +FCON
at current DTE rate; next phase at 19200.
(3) 1 8 Class 2 fax with Bitfax compatibility; +FCON
at 2400 and shift to 19200 at next phase.
(2) 1 4 Reverses the answer; the modem answers in
originate mode.
(1, 0) Reserved.
Code Bits Bin. Dec. Description
(7) Reserved.
(6) 1 64 Enables type 4 ring detection.
(5) 1 32 Enables type 3 ring detection.
(4) 1 16 Enables type 2 ring detection.
(3) 1 8 Enables type 1 ring detection.
(2) 1 4 Enables caller ID detection. (See S24b2, *T)
Code Bits Bin. Dec. Description