Also, each bit can be assigned a value corresponding to its number (e.g.,
the value equals 2 to the power of the bit):
Register
|
Default
|
Function
|
S0
|
0
|
Sets the number of rings on which to
answer in Auto Answer mode. S0=0 disables Auto Answer. S0=1 enables
Auto Answer and the Courier 56K Business Modem answers on the first
ring. |
S1
|
0
|
Counts and stores the number of rings
from an incoming call. |
S2
|
43
|
Stores the ASCII decimal code for the
escape code character. Default character is +. A value
of 128-255 disables the escape code. |
S3
|
13
|
Stores the ASCII decimal code for the
Carriage Return character. Valid range is 0-127. |
S4
|
10
|
Stores the ASCII decimal code for the
Line Feed character. Valid range is 0-127. |
S5
|
8
|
Stores the ASCII decimal code for the
Backspace character. A value of 128-255 disables the Backspace key's
delete function. |
S6
|
0
|
Set the number of seconds the Courier
56K Business Modem waits for a dial tone. |
S7
|
60
|
Sets the number of seconds the Courier
56K Business Modem waits for a carrier. May be set for much longer
duration if, for example, the Courier 56K Business Modem is originating
an international connection. |
S8
|
2
|
Sets the duration, in seconds, for the
pause (,) option in the Dial command and the pause between command
reexecutions (> and A> commands). |
S9
|
6
|
Sets the required duration, in tenths
of a second, of the remote device's carrier signal before recognition
by the Courier 56K Business Modem. |
S10
|
14
|
Sets the duration, in tenths of a second,
that the Courier 56K Business Modem waits after loss of carrier before
hanging up. This guard time allows the Courier 56K Business Modem
to distinguish between a line hit, or other disturbance that momentarily
breaks the connection, and a true disconnect (hanging up) by the remote
device. |
S11
|
70
|
Sets the duration and spacing, in milliseconds,
of dialed tones. |
S12
|
50
|
Sets the duration, in fiftieths of a
second, of the guard time for the escape code (+++) sequence. |
S13
|
0
|
Bit-mapped register. See the beginning
of this chapter for information about setting bit-mapped registers.
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Reset when DTR drops. |
1
|
2
|
Reverse normal Auto Answer operation:
On incoming RING, enter Originate Mode and look for an answer tone.
|
2
|
4
|
Disable 250 ms pause before result code
display. |
3
|
8
|
On DTR signal, autodial the number stored
in NVRAM at position 0. |
4
|
16
|
At power-on/reset, autodial number stored
in NVRAM at position 0. |
5
|
32
|
Disable HST (used for testing V.32terbo
in Dual Standard Courier 56K Business Modems). |
6
|
64
|
Disable MNP Level 3 (used for testing
Level 2). |
7
|
128
|
Hardware reset (works like powering off
and then on). |
S14
|
0
|
Bit-mapped register ( See the beginning
of this chapter for information about setting bit-mapped registers).
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Disconnect on escape code. |
S15
|
0
|
Bit-mapped register. ( See the beginning
of this chapter for information about setting bit-mapped registers).
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable the Courier 56K Business Modem's
extra high-frequency equalisation if it causes problems on shorter-link
calls for HST modulation only. |
1
|
2
|
Disable online fallback. |
2
|
4
|
Disable 450 bps back channel HST only. |
3
|
8
|
Reset non-ARQ mode Transmit buffer from 1.5K bytes
to 128.
The default 1.5K byte non-ARQ buffer allows data
transfer with X- and Y-modem type File Transfer Protocols without
using flow control.
The 128-byte option allows remote users with slower modems to stop
your transmitted data from scrolling off their screens. When remote
users send your computer an XOFF (<Ctrl-S>) and you stop transmitting,
the data in transit doesnt exceed the size of their screen.
|
4
|
16
|
Disable MNP Level 4; retransmitting the
larger Level 4 data blocks may be a problem if you expect a great
number of errors during a call. |
5
|
32
|
Set Backspace key to delete. |
6
|
64
|
Some earlier 2400 bps MNP modems, not
made by USRobotics or Microcom, were not fully compatible with
the MNP protocol. If you have difficulty making a successful 2400
bps MNP connection with a remote MNP modem, it may be because of this
incompatibility. Set S15 to 64 and try again to make the connection.
|
7
|
128
|
Custom applications only.
|
S16
|
0
|
Bit-mapped register. ( See the beginning
of this chapter for information about setting bit-mapped registers).
For testing, refer to the Testing the Connection chapter of the Contents
section. |
|
Bit
|
Value
|
Result
|
1
|
2
|
Dial Test.
|
2
|
4
|
Test pattern.
|
3
|
8
|
Remote digital loopback.
|
S18
|
0
|
Test timer for software-initiated loopback
testing (&Tn); disabled when S18 is set to 0. Used to set the
duration of testing, in seconds, before the Courier 56K Business Modem
automatically times out and terminates the test. |
S19
|
0
|
Sets the duration, in minutes, for the
Inactivity Timer. The timer activates when there is no data activity
on the R232 interface, and at the timeout the Courier 56K Business
Modem hangs up. S19=0 disables the timer. |
S21
|
10
|
Sets, in 10-millisecond units, the length
of breaks sent from the Courier 56K Business Modem to the computer
or terminal. Applies to ARQ mode only. |
S22
|
17
|
Stores the ASCII code for the XON character.
|
S23
|
19
|
Stores the ASCII code for the XOFF character.
|
S24
|
150
|
Sets the duration, in 20-millisecond
units, between pulsed DSR signals when the Courier 56K Business Modem
is set to &S2 or &S3. The default is 3 seconds. |
S25
|
5
|
Sets DTR recognition time in 10-millisecond
units. |
S26
|
1
|
Sets duration, in 10-millisecond units,
of the delay between RTS and the CTS in synchronous mode. |
S27
|
0
|
Bit-mapped register. ( See the beginning
of this chapter for information about setting bit-mapped registers).
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Enable ITU-T V.21 modulation at 300
bps for overseas calls. In V.21 mode, the Courier 56K Business Modem
answers both Bell 103 and V.21 calls, but only originates V.21 calls.
|
1
|
2
|
Enable unencoded (non- trelliscoded)
modulation in V.32 mode; this option is part of the ITU-T V.32 recommendation,
but is rarely used.
|
2
|
4
|
Disable V.32 modulation; used for
testing HST modulation.
|
3
|
8
|
Disable 2100 Hz answer tone to allow
two V.42 devices to connect more quickly.
|
4
|
16
|
See error control handshaking options
below.
|
5
|
32
|
See error control handshaking options
below.
|
6
|
64
|
Disable V.42 Detect Phase
|
7
|
128
|
Unusual software incompatibility.
Some software may not accept some result codes. This setting disables
the codes and displays the 9600 code instead. The call's actual
rate can be viewed on the ATI6 screen.
|
Error control handshaking options:
Select the total value of bits 4 and 5
|
Bit 4
|
Bit 5
|
Result
|
0
|
0
|
Complete handshaking sequence: V.42
Detection, LAPM error control, MNP.
|
16
|
0
|
Disable MNP.
|
0
|
32
|
Disable V.42 Detection and LAPM. |
16
|
32
|
Disable Detection phase, if you know
that the remote Courier 56K Business Modem does LAPM, but not the
Detection phase.
|
S28
|
8
|
Sets the duration in tenths of a second
of the extra 3000/600 Hz answer tones sent during V.32 hand-shaking.
This gives V.32 modems additional time to connect in V.32 mode before
timing out.
If there is difficulty answering older, manually operated V.32 modems
(for example, modems that require a button to be pushed in order to
dial), try lengthening the duration of the extra tones. Setting S28
to zero eliminates the extra tones resulting in a faster connect time
if, for example, the Courier 56K Business Modem is set to use V.21
modulation (300 bps) or V.23 modulation (1200 bps). |
S29
|
20
|
Sets the duration, in tenths of a second,
of the V.21 answer tone. |
S32
|
9
|
Assign Voice/Data switch function |
|
Value
|
Function
|
0
|
Disabled |
1
|
Voice/Data- originate mode |
2
|
Voice/Data- answer mode |
3
|
Redial last number |
4
|
Dial number stored at position 0 |
5
|
Auto answer on/off toggle |
6
|
Reset modem |
7
|
Initiate remote digital loopback |
8
|
Busy out the phone line toggle |
9
|
Execute stored command (see &ZC command) |
S34
|
0
|
Bit-mapped register. See the beginning
of this chapter for information about setting bit-mapped registers.
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable V.32 bis. Used for troubleshooting;
Technical Support may ask you to disable V.32bis for testing purposes.
|
1
|
2
|
Disable the Courier 56K Business
Modem's enhanced, proprietary V.32bis modulation. Used for troubleshooting.
|
2
|
4
|
Disable the faster retrains that
occur during proprietary V.32 terbo modulation. Used for troubleshooting.
|
3
|
8
|
Enable V.23. Required for some British
connections.
|
4
|
16
|
Change MR LED to DSR
|
6
|
64
|
Disable the remote-access busy message.
|
7
|
128
|
Disable V.32 terbo.
|
S38
|
0
|
Sets the duration, in seconds, before a forced hang-up
and clearing of the Transmit buffer when DTR drops during an ARQ
call.
This is provided to allow time for a remote device
to acknowledge receipt of all transmitted data. Default = 0: The
Courier 56K Business Modem immediately hangs up when DTR drops.
If the Courier 56K Business Modem receives the ATH command, it ignores
S38 and immediately hangs up.
|
S41
|
0
|
Sets the number of allowable remote-access login
attempts, thus enabling or disabling remote access.
The default setting of zero allows no remote login
attempts, disabling remote access. A value of 1 or greater enables
remote access. If the number of unsuccessful login attempts exceeds
the limit set by this register, the Courier 56K Business Modem returns
online and any further login attempts during the remainder of that
connection are refused.
|
S42
|
126
|
Stores the ASCII decimal code for the
remote-access escape character. The default character is a tilde (~).
|
S43
|
200
|
Sets the duration, in fiftieths of a
second, of the guard time for the remote-access (~~~~) sequence. |
S44
|
15
|
Sets the duration, in seconds, of the
interval between losing carrier and reestablishing a connection. |
S51
|
0
|
Bit-mapped register. See the beginning
of this chapter for information about setting bit-mapped registers.
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable MNP/V.42 for V.22 (1200 bps)
|
1
|
2
|
Disable MNP/V.42 for V.22 bis (2400
bps)
|
2
|
4
|
Disable MNP/V.42 for V.32/V.32 bis/V.32
terbo (9600/14400/19200/21600 bps).
|
6
|
64
|
Disable Selective Reject
|
S53
|
126
|
Bit-mapped register. ( See the beginning
of this chapter for information about setting bit-mapped registers).
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Dial security enabled.
|
1
|
2
|
Prompting enabled.
|
2
|
4
|
Local-access password protection
enabled.
|
3
|
8
|
DTMF security enabled.
|
Enabling local-access password
protection disables the &Zn=s command (which stores up to 10
phone numbers) because stored phone numbers occupy the same space
in NVRAM as the dialback numbers for Dial Security accounts.
|
S54
|
64
|
Symbol rate bit-mapped register used
primarily by Technical Support for debugging purposes. |
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable 2400 symbol rate.
|
1
|
2
|
Disable 2743 symbol rate.
|
2
|
4
|
Disable 2800 symbol rate.
|
3
|
8
|
Disable 3000 symbol rate.
|
4
|
16
|
Disable 3200 symbol rate.
|
5
|
32
|
Disable 3429 symbol rate. |
6
|
64
|
Disable Call Indicate (CI).
|
7
|
128
|
Disable V.8.
|
S55
|
0
|
Trellis code bit-mapped register used
primarily by USRobotics Technical Support for debugging purposes.
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable 8S-2D mapping.
|
1
|
2
|
Disable 16S-4D mapping.
|
2
|
4
|
Disable 32S-2D mapping.
|
3
|
8
|
Disable 64S-4D mapping.
|
7
|
128
|
Enable phase roll detection
|
S56
|
0
|
Bit-mapped register primarily used by
Technical Support for debugging purposes. |
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable non-linear coding.
|
1
|
2
|
Disable TX level deviation.
|
2
|
4
|
Disable preemphasis.
|
3
|
8
|
Disable precoding.
|
4
|
16
|
Disable shaping.
|
5
|
32
|
Disable V.34+
|
6
|
64
|
Disable V.34.
|
7
|
128
|
Disable V.FC.
|
S58
|
0
|
Bit-mapped register. (See the beginning
of this chapter for information about setting bit-mapped registers.)
|
|
Bit
|
Value
|
Result
|
1
|
2
|
Disable Bler Monitor
|
5
|
32
|
Enables/Disables V.90 |
6
|
64
|
Disables V.92 functions
|
S59
|
0
|
Bit-mapped register. (See the beginning
of this chapter for information about setting bit-mapped registers).
|
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable enhanced V.42bis
|
1
|
2
|
Alternate Caller ID timing
|
S69
|
0
|
Bit-mapped register. (See the beginning
of this chapter for information about setting bit-mapped registers). |
|
Bit
|
Value
|
Result
|
0
|
1
|
Disable external Plug and Play
|
1
|
2
|
Enable Auto Redial
|
2 |
4 |
See HS LED options below |
3 |
8 |
See HS LED options below |
5 |
32 |
Disable Digital Line Guard |
6 |
64 |
Disable Loop Monitor |
HS LED options: Select the
total value of bits 2 and 3 |
|
Bit 2
|
Bit 3
|
Result
|
|
0 |
0 |
HS LED is on at 2400 and above |
|
4 |
0 |
HS LED is on at 14400 and above |
|
0 |
8 |
HS LED is on at 16800 and above |
|
4 |
8 |
HS LED is on at V.90/V.92 and above |
S70
|
0
|
Bit-mapped Register. (See
the beginning of this chapter for information about setting bit-mapped
registers.) |
|
Bit
|
Value
|
Result
|
0
|
1
|
Enable recognition of Ring A
|
1
|
2
|
Enable recognition of Ring B
|
2
|
4
|
Enable recognition of Ring C
|
3
|
8
|
Enable recognition of Ring D
|
4
|
16
|
Enable recognition of Ring E
|
S71
|
0
|
RCID request delay (1/200 sec) |
S72
|
0
|
Bit-mapped Register. (See the beginning
of this chapter for information about setting bit-mapped registers.) |
|
Bit
|
Value
|
Result
|
0
|
1
|
# of requests
|
1
|
2
|
# of requests
|
2
|
4
|
# of requests
|
3
|
8
|
Request duration * 10 mS
|
4
|
16
|
Request duration * 10 mS
|
5
|
32
|
Request duration * 10 mS |
6
|
64
|
Request duration * 10 mS |
7
|
128
|
Request duration * 10 mS |
S73
|
0
|
Bit-mapped Register. (See the beginning
of this chapter for information about setting bit-mapped registers.) |
|
Bit
|
Value
|
Result
|
0
|
1
|
Request level
|
1
|
2
|
Request level
|
2
|
4
|
Request level
|
3
|
8
|
Request pause * 10 mS
|
4
|
16
|
Request pause * 10 mS
|
5
|
32
|
Request pause * 10 mS |
6
|
64
|
Request pause * 10 mS |
7
|
128
|
Request pause * 10 mS |