This thread is for discussions of Com Ports - Technical Information.

I want to design 2 programs Client /server which comunicate thru phone line, using MScomm Control.
But i don't know how to make Mscomm waiting for a call like We do with Winsocket.
could you kindly help me?

i am using MSComm with Visual Basic . it does not read or write anything on the port. i dont have modem in my pc. i only want to read data from serail port rs232. i am using a time and attandance recorder which sends data on com1 and shows it on its software but when i read it with MSCOmm it shows nothing. Mscomm1.intBufferSize is o . please help me soon.

I want to communicate throught the com1 port using a Null modem cable. I need help in this regard.

you need know how make a null modem cable?

http://www.angelfire.com/linux/jsanchez/NullmodemCables.htm

SEND ME AN EMAIL FOR GIVE MORE BEST TECHNICAL HELP.

GOOD DAY!!! AND HARE KRISHNA

I've used MSCOMM on Visual Basic to receive binary data from my own equipment (I've creative it).
Even if I use Binarymode but my data was received is not format that my equipment was send. (My data can't converted by Cint() or Cbyte(), only Val() can converted it but result is zero).
How I can receive binary data by MSCOMM?

Hiii

I really loved this article, nice one!

Here is a complete list of all the AT commands I could get..

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Table 1. Basic Data Modem AT Commands
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A/    Repeat the last AT command string issued.
   An “AT” prefix is not used. Do not terminate this command
   with <ENTER>.

A    Answer.
   Go off-hook and enter the answer mode. After 3 seconds the
   modem will initiate an answer tone.

Bn    ITU-T or Bell® (Default=1)

   B0    Use ITU-T V.22 at 1200 bps, and ITU-T V.21at 300 bps
   B1    Use Bell® 212A at 1200 bps, Bell® 1035 at 300 bps.
   B2    Use ITU-T V.23 only. The originating modem transits at 75
       bps (and receives at 1200 bps); the answering modem receives
       at 75 bps (and transmits at 1200 bps)
   B3    Selects ITU-T V.23 only. The originating modem transmits at
       1200 bps (and receives at 75 bps); the answering modem
       receives at 1200 bps (and transmits at 75 bps)

Cn    Carrier control option (Default=1)

   C0    Transmit carrier always off
   C1    Normal transit carrier


D    Dial command


En    Command Echo (Default=l)

   E0    Disables command echo from the modem.
   E1    Enables command echo from the modem.

Fn    Online echo (Default=1)
   
   F0    Enables online echo
   F1    Disables online echo

Hn    Hook Switch Control (Default=0)

   H0    Hangs up the telephone line
   H1    Picks up the telephone line

In    Identification/checksum option (Default=0)
   I0    Reports product code
   I1    Reports modem chip firmware version
   I2    Verifies ROM checksum
   I3    Reports device set name
   I4    Reserved
   I5    Reserved for modem chip hardware configuration
   I6    Country code
   I7    Version of board manufacturer firmware
   I8    Features of modem firmware
   I10    Modem board configuration - bit set by board manufacturer
   I11    Modem board configuration - bits set by board manufacturer
   I14    SAFE device
   I20    Cirrus Logic silicon version
   I21    Cirrus Logic firmware version
   I22    Cirrus Logic manufacturer name
   I23    Cirrus Logic product model
   Ln    Speaker Volume control (Default=2)
   L0,1    Low volume.
   L2    Medium speaker volume
   L3    High speaker volume

Mn    Speaker On/Off (Default=1)
   M0    Speaker off.
   M1    Speaker on until modem detects the carrier signal.
   M2    Speaker is always on when modem is off-hook.
   M3    Speaker off during dialing, on until modem carrier present

Nn    Select data rate handshake (Default=1)
   N0    Handshake only at DTE-to-modem data rate
   N1    Begins handshake at DTE-to-modem data rate and falls to
       highest compatible rate

On    Go Online (Default=0)
   O0    Returns modem to data mode
   O1    Retrains equalizer and then returns to data mode

P    Pulse Dial

Qn    Result Codes (Default = 0)
   Q0    Enables display of result codes
   Q1    Disables display of result codes

Sn    Select an S-register
   Sn=x    Write to an S-Register
   Sn?    Read from an S-Register

T    Tone Dial

Vn    Result Codes Format (Default=1)
   V0    Enable short-form result codes. (Numeric)
   V1    Enable long-form result code. (Text or Verbose)

Wn    Response code data rate (Default=0)
   W0    Reports DTE speed response codes
   W1    Reports DTE speed response codes
   W2    Reports DCE speed response codes
   W3    Reports DTE speed response codes and information on error
       correction and data compression

Xn    Result Code type (Default=4)
   X0    Enables result codes 0-4; disables detection of busy and dial
       tone
   X1    Enables result codes 0-5, 10, and above; disables busy and dial
       tone detection
   X2    Enables result codes 0-6 and 10 and above; disables busy
       detection and enables dial tone detection
   X3    Enables result codes 0-5, 7, and 10 and above; enables busy
       detection and disables dial tone detection
   X4    Enables result codes 0-7 and 10 and above; enables busy and
       dial tone detection

Yn    Long Space Disconnect (Default=0)
   Y0    Disable Long Space Disconnect
   Y1    Enable Long Space Disconnect

Zn    Recall stored profile (Default=0)
   Z0    Resets modem and recalls user profile 0
   Z1    Resets modem and recalls user profile 1

&Cn    DCD (data carrier detect) option (Default=1)
   &C0    Ignores remote modem status; DCD always on
   &C1    DCD set according to remote modem status

&Dn    DTR Control, Data Terminal Ready (Default=2)
   &D0    In async mode, modem ignores DTR
   &D1    Modem switches to command mode when DTR switches on
   &D2    When DTR switches off, the modem goes on-hook and
       disables auto-answer mode; when DTR switches on, autoanswer
       is enabled
   &D3    Turning off DTR re-initializes the modem and resets values
       except UART registers

&F    Load factory defaults

&Gn    Guard tone option (1200 bps and 2400

Good Day,

I'm using VB6 MSComm with "2400,n,7,1" (settings) to dial up using ArtNet modem. I couldn't get any dial tone with the mentioned setting. However, when i change to "2400,n,8,1" it will be able to dial up ? When i use hyperterminal with "2400,n,7,1" to dial up, no problem at all. Any idea what's wrong ? Thanks in advance.

Modem CODES AT Attention Code. Must appear at start of all commands except A/ and +++.
A Answer Command. Answer incoming call.
A/ Repeat Last Command.
Bn Bell Compatibility
B,B0 Variable connection rate ITU-T (CCITT) Compatibility.
B1 Variable connection rate Bell Compatibility.
B2 Auto-mode V.22/Bell 212A protocols.
B4 300 bps Bell 103 protocol.
B5 1200 bps V.22/Bell 212A protocols.
B6 2400 bps V.22/bis protocol.
B7 4800 bps V.32 protocol.
B8 9600 bps V.32 protocol.
B9 14,400 bps V.32 bis protocol.
Ds Dialing Command
DP Dialing Command. Pulse Dialing.
DR Dialing Command. Reverse.
DS Dialing Command. Dial one of the srored numbers.
DT Dialing Command. Tone Dialing.
D@ Dialing Command. Wait for 5 seconds quiet.
D, Dialing Command. Pause.
D; Dialing Command. Resume command mode after dialing.
D! Dialing Command. Hook Flash.
E Echo Command
E,E0 Echo Off.
E1 Echo On.
Hn Switch-Hook Control.
H,H0 On Hook (hang up phone).
H1 Off Hook (pick up phone).
In Request Product Code and Checksum.
I,I0 Return Product Code.
I1 ROM checksum, product ID, ROM version number.
I2 Compute ROM checksum.
I3 Error Correctio Code.
I4 Product ID, ROM version number, modem chip type, fax operatnig mode.
Ln Speaker Volume
L,L0,L1 Speaker Volume. Low Volume.
L2 Speaker Volume. Medium Volume.
L3 Speaker Volume. High Volume.
Mn Monitor on/off
M,M0 Speaker off.
M1 Speaker on until online.
M2 Speaker always on.
M3 Speaker on until online and off while dialing.
On Return to online mode.
O,O0 Return to online mode.
O1 Return to online mode and start retrain sequence.
O2 Fall forward. Return to online mode.
O3 Fall back. Return to online mode.
P Pulse dialing.
Qn Quiet Command
Q,Q0 Display result codes.
Q1 Don't display result codes.
Q2 Display result codes when originating a call.
Q3 Return numeric results 32 and 30 for CONNECT 9600 and CONNECT 4800.
Q4 Return numeric results 12 and 11 for CONNECT 9600 and CONNECT 4800.
Sr Direct Register Command
Sn Select register n as default register.
Sn? Read and display value in register n.
Sn?^ Read and display value in register n in HEX.
Sn=N Set register n to value N.
Sn=N^ Set register n to value N in HEX
Vn Verbal/Numeric Result Codes.
U Update System password.
V,V0 Numeric Result Codes.
V1 Verbal Result Codes.
Xn Enable Extended Result Code
X,X0 No wait for dial tone. No busy. CONNECT 0-4 returned.
X1 No wait for dial tone. No busy. CONNECT 0-5 and 9-20 returned.
X2 Wait for dial tone. No busy. CONNECT 0-6 and 9-20 returned.
X3 No wait for dial tone. Busy recognized. CONNECT 0-5,7 and 9-20 returned.
X4 Wait for dial tone. Busy recognized. CONNECT 0-7 and 9-20 returned.
Y Long Space Disconnect
Z Reset Command
&V Display al stored profiles.
&Zn=s Store telephone number.
+++ Escape Code. Switch from data mode to command mode.

thanks to Oliver Lawrence lawrence@cdnet.cod.edu <lawrence@cdnet.cod.edu>

do your problem has solved?
I meet the same problem now, visual basic text doesn't give any response to binary input.

I really need your solution, if you already have it

thanks

However, i think you need to perfect it more on a particular section ....

Do you know what command to issue so that when i call up the receiver's HP, i can get to know whether the receiver phone is ringing? and count the number of times the phone ring?? get i get those reponse? cause i am trying to do a miss call.
In order to do that i need to know whether the phone rings .. if so i will let the phone ring for 3 times ... then hang up
..



Another question is :

comEvRing "6"
Ring detected. Some UARTs (universal asynchronous receiver-transmitters) may not support this event.

i understand that the above means that ring is detected. when the CommEvent is "6". However, what does it mean some UARTs may not support it ...

Can any expert show me what that means? i dont seem to understand it.

and my current modem is :
3COM US ROBOTICS 56K FaxModem Model (455630-01)

does my modem support that?

i am using mscomm with visual basic. i want to read/write data on serial port rs232. what code will i have to write and what properties i will have to change in mscomm. please help me as soon as possible.

Hi U
Can U  show me some page ,apllicate this code by VB
thanks,i need it so much

Hi U
Can U  show me some page ,apllicate this code by VB . U can send my mail kychinh2002@yahoo.com
thanks,i need it so much