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 and the COM numbers were not assigned consecutively. […]
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.
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 can be located in the Microsoft Windows Device Manager. If you are not using the Sealevel […]
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 sharing to work properly, all devices connected to an interrupt must support sharing. If any […]
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.
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 or convert a legacy pin out. Sealevel offers a D-Shell Modular Adapter Kit (Item# DB102) […]
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 connect another USB serial adapter, it has a different […]
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 increases the CPU overhead of the driver. A full USB […]
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 data throughput while reducing network traffic.
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 servers. Perform an end-to-end loopback test. This tests the local serial server’s […]