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1 Can I change the COM number assignment for my Sealevel serial card?

There are only a few cases where you would want to change a COM number assignment. Your application only works at COM1 through COM4 and the Sealevel serial device you just installed comes in at COM5 or higher. Or, you just installed a multiport serial card…

2 Can I use a PCI or PCIe serial port as a replacement for COM1?

Using Sealevel's COM Port Manager utility provided with our SeaCOM software suite, a PCI or PCIe serial port can be named "COM1." After that is done, any program can open "COM1" to communicate with a device attached to that PCI or PCIe serial port.

3 Do I need to terminate modem control signals if I'm not using them?

It is always a good idea to terminate any un-used signal lines. Floating signals can generate interrupts and drastically degrade system performance. The Sealevel SeaCOM serial driver provides a means of suppressing modem control interrupts. The driver features…

4 Do Sealevel products support interrupt sharing with other devices?

Yes. The Sealevel SeaCOM serial driver fully supports interrupt sharing. There are however a couple of points to mention. All Sealevel PCI serial cards fully support interrupt sharing on Windows 95/98/ME/2000/XP and Vista operating systems. In order for interrupt…

5 Do you have sample Windows programs for writing to a serial port?

We offer serial programming samples with source code in the archive link below. Examples of programming samples include: a simple terminal program; a program to toggle modem control signals; and a Win32 API program to send and receive test data.

6 Does Sealevel offer kits for customizing serial cables?

Sealevel offers several accessories for interfacing many serial connections. The universal D-Shell Converter Kit (Item# DB101) includes DB9 and DB25 Male and Female connectors, D-sub hoods and wires. The DB101 makes it easy to build a custom gender adapter…

7 How can I guarantee that different USB serial adapters will use the same COM port assignments?

When you connect a USB serial adapter to a computer, the operating system assigns individual COM port numbers to each serial port. Each USB serial adapter has a unique ID and the COM port numbers are retained even when the adapter is disconnected. When you…

8 How can I improve the performance of my USB to serial adapter?

Sealevel USB serial adapters are supported by the SeaCOM driver, which includes a latency timer with a default setting of 16 msec. Decreasing this value reduces the amount of time a USB device buffers data before completing a write to the host computer, which…

9 How can I optimize my SeaLINK Ethernet serial server for lower latency?

To optimize a SeaLINK Ethernet serial server for lower latency, disable Nagle’s algorithm on both the SeaLINK device and virtual COM port driver. SeaLINK devices and drivers use Nagle’s algorithm, also referred to as “nagling”, to increase serial…

10 How can I test to see if data is going through my serial tunnel?

A serial tunnel is formed by two Ethernet serial servers that transmit data received by the local serial port through a TCP/IP connection out through the remote serial port. Below are two simple methods for observing the traffic between the Ethernet serial…

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