Resource Center

Computing

FAQs

What size are COM Express modules?

Feb 1st 2012

The PICMG COM Express module specification revision 2.0 describes three sizes of COM Express modules: Basic, Compact and Extended.Basic modules are the most comm … View More

Asynchronous Serial Faqs

FAQs

Where do I find a Linux driver for my Sealevel asynchronous serial adapter?

Dec 28th 2011

Most Sealevel serial adapters use the serial drivers built into the Linux kernel. For USB and UART-based serial adapters, the Linux drivers may need additional i … View More

FAQs

General Questions

How do I create a ‘silent install’ for a Sealevel software driver in Microsoft Windows?

Dec 28th 2011

All current Sealevel software packages can be silently installed by running the installer with the /S /v/qn command line switches. This is demonstrated for SeaCOM 3.8 … View More

Asynchronous Serial Faqs

FAQs

How to configure USB serial adapters in Linux

Dec 23rd 2011

The serial USB driver in Linux contains many product IDs for Sealevel devices. However, the newest devices may not be currently included in the driver. This gu … View More

Asynchronous Serial Faqs

FAQs

How to add missing vendor/product IDs for UART-based serial adapters in Linux

Dec 23rd 2011

Linux supports the direct use of 16XXX UART-based devices with the drivers included in the kernel sources. However, kernel versions prior to 3.7.0-rc6 are missing … View More

Asynchronous Serial Faqs

FAQs

How to integrate the 2107 USB to serial adapter into your RS-485 network

Dec 8th 2011

 The 2107 is designed for two-wire (half duplex) RS-485 applications and provides reduced wiring costs and protection against EMI and other induced line noise … View More

Analog I/O

FAQs

How can I measure floating analog signals?

Dec 1st 2011

We recommend using a SeaI/O-570 module, which has eight 16-bit A/D inputs that are capable of measuring floating, or non-referenced, analog signals.For instruction … View More

Analog I/O

FAQs

What is a floating analog signal?

Dec 1st 2011

 A floating signal source is a signal that is not connected in any fashion to the building ground system but rather has an isolated ground reference point … View More

Digital I/O Faqs

FAQs

What wire colors are used for RS-485 on a SeaI/O module?

Dec 1st 2011

We assume that you want to use a standard (CAT5/6 EIA/TIA-568B) Ethernet patch cable to connect to the RJ45 pass-through connector on the side of the SeaI/O module, d … View More

Computing

FAQs

What signal connections or I/O interfaces can Sealevel design into a COM Express carrier board?

Nov 8th 2011

  COM Express is the most commonly used Computer on Module implementation. Although there are three different sizes and other technical variations, the Basic … View More

Computing

FAQs

What is a COM Express Module?

Nov 1st 2011

  COM stands for “Computer on Module”. A COM Express module is a small, integrated computer board that contains the CPU and memory, video, Ether … View More

Digital I/O Faqs

FAQs

Why does my Sealevel Digital I/O TTL adapter have 5 volts present after system power on?

Oct 1st 2011

TTL I/O devices are commonly used to control solid-state relay modules that interface a variety of input and output devices.  An important consideration in t … View More

Asynchronous Serial Faqs

FAQs

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

Sep 1st 2011

 Microsoft Windows maintains the configuration (enumeration) information for every USB device that has ever been connected, unless you explicitly uninstalled th … View More

Analog I/O

FAQs

How should unused analog inputs be handled?

Sep 1st 2011

 Non-connected analog inputs should always be connected to the analog ground or common reference terminal. This eliminates phantom readings on all unuse … View More

Asynchronous Serial Faqs

FAQs

What 9-bit serial format is supported by Sealevel SeaLINK Ethernet serial servers?

Jul 30th 2011

 Sealevel SeaLINK Ethernet serial servers support a 2-byte format to marshal 9-bit serial data between the host computer and the serial server. The least signif … View More

Asynchronous Serial Faqs

FAQs

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

Jul 30th 2011

 SeaLINK Ethernet serial servers use RFC-2217, the Telnet COM port control protocol, to transmit modem control signals in serial tunneling mode. Since S … View More

FAQs

Serial

How do you transmit a continuous stream of synchronous serial data without any “idle time”?

May 27th 2011

 Sealevel synchronous serial adapters are capable of a constant output stream if the application program can provide a constant stream of serial data. If you ar … View More

FAQs

Serial

What clocking modes do Sealevel synchronous serial adapters support?

May 27th 2011

 Sealevel synchronous serial adapters support the three most common non-encoded clocking modes:The Sealevel serial adapter provides the clock using the baud ra … View More