File: atcmds.txt
3Com Corporation
3Com Megahertz 10/100 LAN + 56K Modem PC Card
(3CCFEM556 PC Card family)
AT Commands and S Register Settings
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AT Command Quick Reference
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&$ HELP, Ampersand Commands Mn n=0 Speaker Off
A/ Repeat Last Command n=1 Speaker On Until CD
A> Continuously Repeat Command n=2 Speaker Always On
AT Command Mode Prefix n=3 Speaker Off During Dial
A Answer Call On n=0 Return Online
Bn n=0 V32 Mode/CCITT Answer Seq n=1 Return Online & Retrain
n=1 Bell Answer Seq P Pulse Dial
Dn Dial a Telephone Number Qn n=0 Result Codes Sent
n=0..9#*TPR,;"W@!()-& n=1 Quiet (No Result Codes)
DL Dial Last Phone Number n=2 Verbose/Quiet On Answer
DSn Dial Stored Phone Number n=3 Ring Message (Voice mode)
D$ HELP, Dial Commands Sr=n Sets Register "r" to "n"
En n=0 No Command Echo Sr? Query Register "r"
n=1 Echo Command Chars S$ HELP, S Registers
Fn n=0 Online Echo T Tone Dial
n=1 No Online Echo Vn n=0 Numeric Responses
Hn n=0 On Hook (Hang Up) n=1 Verbal Responses
n=1 Off Hook Xn n=0 Basic Result Codes
In n=0 Product Code n=1 Extended Result Codes
n=1 Checksum n=2-4 Advanced Result Codes
n=2 RAM Test Yn n=0 Next reset to &W0 settings
n=3 Product ID String n=1 Next reset to &W1 settings
n=4 Current Settings n=2 Next reset to &F0 settings
n=5 NVRAM Settings n=3 Next reset to &F1 settings
n=6 Link Diagnostics n=4 Next reset to &F2 settings
n=7 Product Configuration Z n=0 Y setting determines reset
n=8 OK n=1 Reset to &W0 settings
n=9 PnP ID n=2 Reset to &W1 settings
n=10 ERROR n=3 Reset to &F0 settings
n=11 Link Diagnostics n=4 Reset to &F1 settings
Ln n=0 Lowest Speaker Volume n=5 Reset to &F2 settings
n=1 Low Speaker Volume +++ Escape Code
n=2 Med Speaker Volume $ HELP, Command Summary
n=3 Hi Speaker Volume
Cellular Commands
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&F5 Load cellular defaults &F6 Load ETC mode, wait for
~Z Toggle enhanced mode cellular call
Dial Commands
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0-9 Digits to Dial
* Auxiliary Tone Dial Digit
# Auxiliary Tone Dial Digit
T Tone Dialing
P Pulse Dialing
R Call an Originate Only Modem
, Pause (Wait for S8 Time)
; Remain in Command Mode After Dialing
" Used to Dial Alpha Phone #'s
W Wait for Dial Tone (X2,X4)
@ Wait for an Answer (X3,X4)
! Flash Switch Hook
& Wait for credit card
Ampersand Commands
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&An n=0 Disable /ARQ Result Codes &Pn n=0 N.American Pulse Dial
n=1 Enable /ARQ Result Codes n=1 UK Pulse Dial
n=2 Enable /Modulation Codes &Rn n=0 CTS Follows RTS
n=3 Enable /Extra Result Codes n=1 Ignore RTS
&Bn n=0 Floating DTE Speed n=2 RX to DTE/RTS high
n=1 Fixed DTE Speed &Sn n=0 DSR Always On
n=2 DTE Speed Fixed When ARQ n=1 Modem Controls DSR
&Cn n=0 CD Always On &Tn n=0 End Test
n=1 Modem Controls CD n=1 Analog Loopback (ALB)
&Dn n=0 Ignore DTR n=3 Digital Loopback (DLB)
n=1 On-Line Command Mode n=4 Grant Remote DLB
n=2 DTE Controls DTR n=5 Deny Remote DLB
n=3 DTE Controls DTR and reset n=6 Remote Digital Loopback
&Fn n=0 Load Factory Configuration n=7 Remote DLB With Self Test
n=1 Hardware Flow Control Cnfg. n=8 ALB With Self Test
n=2 Software Flow Control Cnfg. &Un Lowest Link Speed Limit
&Gn n=0 No Guard Tone n=0 Disabled
n=1 550 Hz Guard Tone n=1 300 bps
n=2 1800 Hz Guard Tone n=2 1200 bps
&Hn n=0 Disable TX Flow Control n=3 2400 bps
n=1 CTS n=4 4800 bps
n=2 Xon/Xoff n=5 7200 bps
n=3 CTS and Xon/Xoff n=6 9600 bps
&In n=0 Disable RX Flow Control n=7 12000 bps
n=1 Xon/Xoff n=8 14400 bps
n=2 Xon/Xoff Chars Filtered n=9 16800 bps
n=3 HP Enq/Ack Host Mode n=10 19200 bps
n=4 HP Enq/Ack Terminal Mode n=11 21600 bps
n=5 Xon/Xoff for non-ARQ Mode n=12 24000 bps
&Kn n=0 Disable Data Compression n=13 26400 bps
n=1 Auto Data Compression n=14 28800 bps
n=2 Enable Data Compression n=15 31200 bps
n=3 Selective Data Compression n=16 33600 bps
&Mn n=0 Normal Mode n=17 Minimum link rate 33333 bps
n=4 ARQ/Normal Mode n=18 Minimum link rate 37333 bps
n=5 ARQ Mode n=19 Minimum link rate 41333 bps
&Nn n=0 Highest Link Speed n=20 Minimum link rate 42666 bps
n=1 300 bps n=21 Minimum link rate 44000 bps
n=2 1200 bps n=22 Minimum link rate 45333 bps
n=3 2400 bps n=23 Minimum link rate 46666 bps
n=4 4800 bps n=24 Minimum link rate 48000 bps
n=5 7200 bps n=25 Minimum link rate 49333 bps
n=6 9600 bps n=26 Minimum link rate 50666 bps
n=7 12000 bps n=27 Minimum link rate 52000 bps
n=8 14400 bps n=28 Minimum link rate 53333 bps
n=9 16800 bps n=29 Minimum link rate 54666 bps
n=10 19200 bps n=30 Minimum link rate 56000 bps
n=11 21600 bps n=31 Minimum link rate 57333 bps
n=12 24000 bps &Wn n=0 Store Configuration 0
n=13 26400 bps n=1 Store Configuration 1
n=14 28800 bps &Yn n=0 Destructive
n=15 31200 bps n=1 Destructive/Expedited
n=16 33600 bps n=2 Nondest./Expedited
n=17 33333 bps n=3 Nondest./Unexpedited
n=18 37333 bps &Zn=s Store Phone Number
n=19 41333 bps &Zn=L Store Last Phone Number
n=20 42666 bps &Zn? Query Phone Number
n=21 44000 bps
n=22 45333 bps
n=23 46666 bps
n=24 48000 bps
n=25 49333 bps
n=26 50666 bps
n=27 52000 bps
n=28 53333 bps
n=29 54666 bps
n=30 56000 bps
n=31 57333 bps
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S Register Functions
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S0 Ring to Answer On
S1 Counts # of Rings
S2 Escape Code Char
S3 Carriage Return Char
S4 Line Feed Char
S5 Backspace Char
S6 Wait Time/Dial Tone (sec)
S7 Wait Time/Carrier (sec)
S8 Comma Time (sec)
S9 Carrier Detect Time (1/10sec)
S10 Carrier Loss Time (1/10sec)
S11 Dial Tone Spacing (msec)
S12 Escape Code Time (1/50sec)
S13 Bit Mapped
1 = Reset On DTR Loss
2 = Reduced Non-ARQ TX Buffer
4 = Set DEL=Backspace
8 = Do DS0 On DTR
16 = Do DS0 On Reset
32 = Reserved
64 = Disable Quick Retrains
128 = Escape Code Hang Up
S14 Reserved
S15 Bit Mapped
1 = MNP/V.42 Disabled in V.22
2 = MNP/V.42 Disabled in V.22bis
4 = MNP/V.42 Disabled in V.32
8 = Disable MNP Handshake
16 = Disable MNP Level 4
32 = Disable MNP Level 3
64 = Unusual MNP-Incompatibility
128 = Disable V.42
136 = Disable V.42 Detect Phase
S16 Test Modes
1 = Reserved
2 = Dial Test
4 = Reserved
8 = Reserved
16 = Reserved
32 = Reserved
64 = Reserved
128 = Reserved
S17 Reserved
S18 &Tn Test Timeout (sec)
S19 Inactivity Timeout (min)
S20 Reserved
S21 Break Length (1/100sec)
S22 Xon Char
S23 Xoff Char
S24 Reserved
S25 DTR Recognition Time (1/100sec)
S26 Reserved
S27 Bit Mapped
1 = V.21 Mode
2 = Disable TCM
4 = Disable V.32
8 = Disable 2100hz
16 = Enable V.23 Fallback
32 = Disable V.32bis
64 = Disable V.42 Selective Reject
128 = Software Compatibility Mode
S28 V.32 Handshake Time (1/10sec)
S29 V.21 answer mode fallback timer
S30 Reserved
S31 Reserved
S32 Connection bit mapped operations
1 = V.8 Call Indicate enable
2 = Enable V.8 mode
4 = Disable V.FC modulation
8 = Disable V.34 modulation
16 = Disable V.34+ modulation
32 = Reserved
64 = Reserved
128 = Reserved
S33 V.34 & V.34+ Connection setup
Bit Mapped control flags
1 = Disable 2400 Symbol rate
2 = Disable 2743 Symbol rate
4 = Disable 2800 Symbol rate
8 = Disable 3000 Symbol rate
16 = Disable 3200 Symbol rate
32 = Disable 3429 Symbol rate
64 = Reserved
128 = Disable Shaping
S34 V.34 & V.34+ Connection setup
Bit Mapped control flags
1 = Disable 8S-2D trellis encoding
2 = Disable 16S-4D trellis encoding
4 = Disable 32S-2D trellis encoding
8 = Disable 64S-4D trellis encoding
16 = Disable Non linear coding
32 = Disable TX level deviation
64 = Disable Pre-emphasis
128 = Disable Pre-coding
S35 Reserved
S36 Reserved
S37 Reserved
S38 Disconnect Wait Time (sec)
S39 Reserved
S40 Reserved
S41 Reserved
(%ver atcmds.txt v1.0)
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.