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11 How can two serial devices communicate without using a PC?

The simplest method is to use a null modem cable (Item# CA213), which reverses the transmit and receive signals between the serial devices. This method only works for short distances. For distances over 50 feet, a better method is to use a pair of Sealevel…

12 How do I change the COM port assignment for my asynchronous serial adapter?

Sealevel recommends using the installed COM numbers if at all possible to avoid system conflicts. If you previously installed a USB or PCMCIA serial interface, it will have resources assigned by the operating system. If the device is not currently connected…

13 How do SeaLINK Ethernet serial servers transmit modem control signals in serial tunneling mode?

SeaLINK Ethernet serial servers use RFC-2217, the Telnet COM port control protocol, to transmit modem control signals in serial tunneling mode. Since SeaLINK Ethernet serial servers are DTE devices, they follow standard null-modem conventions to tunnel output…

14 How do you connect an RS-232 serial device that is more than 50 feet away from the computer?

The most convenient method is to use a Sealevel Interface Converter to convert the electrical interface from RS-232 to RS-422 or RS-485. Use one of our interface converters at each end, with standard twisted pair cable in between, and you can communicate…

15 How does the performance of Sealevel Ethernet serial servers compare to native serial ports?

Sealevel Ethernet serial servers are designed to mimic the behavior of native PC serial ports. Legacy software can communicate with the Ethernet serial server’s virtual COM port as though it was connected to a native COM port.

16 How does the Sealevel SeaCOM serial driver differ from the Microsoft serial driver?

The SeaCOM serial driver looks exactly like the Windows driver to your application. SeaCOM uses the same API and calls as the Microsoft driver. However, SeaCOM provides many additional features not provided by the Microsoft serial driver such as: Auto RS-485…

17 How to uninstall a USB device that is no longer connected to a computer?

Microsoft Windows maintains the configuration (enumeration) information for every USB device that has ever been connected, unless you explicitly uninstalled the device before unplugging it. When a USB device is not physically connected to the computer, Windows…

18 I am using a Sealevel GPS modified board. How do I set the data rate?

The GPS modified boards are designed to work primarily with the Rockwell Collins GPS receiver with a data rate of 76.8 Kbps. The modification is necessary because 76.8 Kbps is not a standard baud rate. To get 76.8 Kbps select 115.2 Kbps as your data rate…

19 I have to reinstall a Sealevel serial product. What is the best way?

For Windows 95/98/ME/2000/XP/Vista, use Device Manager to uninstall the product prior to removing it from the computer or unplugging it, as in the case with USB serial. This ensures that when the product is reinstalled, the system will see it as a new piece…

20 I'm having problems with my USB serial device under Windows XP.

There are known issues with the USB driver built into Windows XP SP1 (Service Pack 1) that affect suspend, hibernation, and restarting. This issue potentially affects all USB devices and is not specific to those manufactured by Sealevel. Microsoft released…

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