ARNAV RCOM-100, Installation Manual

ARNAV Systems, Inc. 

13

Document No. 570-8050B 

27 November 2002 

4.     DATA PORT 

 
The Data Port allows the user to connect a computer to the RCOM-100 to access data services. 
There are 2 types of data services handled by the Data Port: Asynchronous, and Packet Data. In 
both of these services the equipment interfacing to the RCOM-100 must be configured for 19200-
baud, 8 bits, 1 stop bit, no parity, hardware handshaking, with EIA/TIA RS-232 standard signal 
levels.  
 
The data port in the RCOM-100 is wired to a DB9 connector and is intended for use by only 
approved computing devices in the aircraft.  If the data port is used by an approved device, the 
instructions below define the data port capabilities and requirements. 
 

Asynchronous Services: 

 
Asynchronous Services establishes a data connection between a computer or other device 
connected to the data port, and any Hays compatible modem that is connected to the Public 
Switched Telephone Network.  The connection between the device and the remote modem is 
accomplished by dialing from the AT command line the number of the remote modem (i.e. 
ATD18883359533 <ENTER>). Once the connection is established between the 2 modems, 
binary data, or ASCII data can be transmitted. Sending the “+++” followed by a delay of longer 
than 1 second then the “ATH” terminates the connection.  
 
 

Packet Services: 

 
The data connection is established by the computer issuing a dialing command “ATD#777 
<enter>”. This starts a PPP session using the TCP/IP protocol. Sending the “+++” followed by a 
delay of longer than 1 second then the “ATH” terminates the connection.  
 
The PPP connection using TCP/IP can be set up as a standard Windows Dial Up networking 
connection or it can be part of the connecting application.  In order to access data through the 
Packed Services you must have an Internet service provider that allows remote connection 
through a gateway.  Your dial up connection must be set up as follows: 
 

Modem Setup: 

Add the RCOM-100 Qualcomm modem INF file to your computer: 
Windows 98 example: 
Select: Start – Settings – Control Panel – Modems 
Select: Add Modem 
Check: Do not detect modem; I will select it from a list 
Select: Next 
Select: Have Disk 
Insert the supplied floppy disk into the A: drive 
Make sure the A: drive is selected as the file source and select OK 
The Modem will be identified as Qualcomm Globalstar Phone Modem 
Select: Next 
Select: the communications port on your computer that will connect to the RCOM-100 
Select: Next 
Select: Finish 
In the Modem Properties Dialog Box – Select the new Globalstar Modem and click Properties 
Change the Baud Rate to 19200 and press OK