FILE TRANSFER

After device driver is installed and communication parameters are setup, you may use standard device name (COM1 and COM2 like) to send and receive data to/from the port you specify. 

In PCCOM, we also provide TX.EXE and RX.EXE utilities to perform  file  transfer functions, which are more flexible.   

5.1 Transmit File to Remote Site 

The   command  format  of   TX.EXE   is specified in the follows. 

TX [/PnoLR < filename] 

filename

Select which file to be transmitted  to remote site.  The < filename specification is I/O  redirection of MS/DOS.  Suppose you want key  in  characters from keyboard  to  remote site,  you  need  not specify file  name  and after   end  of  transmission,  please   type Z/CTRL. 

Pno

      Select which I/O port to send data. The default is P0. 

L

      Specify  the transmitted data are local echo on the screen. 

R

Specify  the transmitted data are  echo from remote site to local screen. 

NOTE

If  the  received  file  size  less  one character  than  the transmitted  file  size, don't  worry!  the TX.EXE program  eliminates one <CR> code from transmitted file. 

EXAMPLE 5.1.1  

Suppose we want send COMLIBBC.C file to remote site through port number 2. The command is as follows. 

A>  TX /P2 < COMLIBBC.C 

EXAMPLE 5.1.2 

To  send  RRX.C  file  to  remote  site through port number 0. 

A>  TX < RRX.C

EXAMPLE 5.1.3 

To send RRX.C file to remote site through port number 3 and local echo the RRX.C contents on the monitor.

A>  TX /P3L < RRX.C 

EXAMPLE 5.1.4 

Key in data to remote site through port number 0. 

5.2 Receive Data from Remote Site 

The RX.EXE is used to receive data file from remote site, its command format is specified in the follows. 

RX [/PnoE > filename] 

      Select  which I/O port to receive data. The default is P0. 

L

      Specify  the  received data  are  local echo on the screen. 

R

      Specify  the received data are echo  to the sending site. 

Suppose you want store received data to disk file,  please use MS/DOS I/O redirection features.  To redirect your I/O, type the following command. 

 A>  RX /P4 >temp.dat 

The  received data will be stored to temp.dat  file. 

EXAMPLE 5.2.1  

Suppose we want receive data   from remote  site  through  port  number  2.   The command is as follows.

  A>  RX /P2 

EXAMPLE 5.2.2 

To   receive  data  from  remote   site through port number 0. 

            A>  RX  

EXAMPLE 5.2.3 

To  receive  data  from   remote   site through  port  number 3 and  stores  received data   to  temp.dat  file.  Local  echo   the

received data are active. 

  A>  RX /P3L >temp.dat   

5.3 Two Way Communication 

To  transfer file from one computer  to another  computer,  the communication  scheme and command are shown in the following. 

TX /P2L < temp.dat                                    RX /P1L > aa.dat 

There are several combinations of  local echo  and remote echo.  In the following,  we give  some examples to explain how to  use  L and R parameters. 

EXAMPLE 5.3.1 

Suppose   your   receiver site   is   a terminal, and transmitter site is a PC, and you want to see the transmitted data on the PC screen, then command of transmitter site is  

A>  TX /P0L < TEMP.DAT 

EXAMPLE 5.3.2 

The  same as the EXAMPLE 5.3.1,  but you need  not display transmitted data on the  PC screen. 

A>  TX < TEMP.DAT 

EXAMPLE 5.3.3 

Suppose   your   transmitter   site   is terminal  who has no ability to  display  the key  in data on the terminal (no  local  echo ability)  and  receiver site is PC.  In  this case  the  receiver site must  echo  received characters to the terminal. The command is 

A>  RX /R > AA.DAT 

EXAMPLE 5.3.4 

The same as EXAMPLE 5.3.3,  but you want receiver  site display the received  data  on the screen.

  A>  RX /LR > AA.DAT

EXAMPLE 5.3.5 

Both  receiver and transmitter site  are PC,  and  you need not show  the  transmitted data. 

 EXAMPLE 5.3.6 

The same as EXAMPLE 5.3.5,  but you need show the data on the both computer. 

another method is 

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