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Asynchronous Serial Faqs

FAQs

How to resolve communication issues affecting Sealevel’s XR17V35X based serial devices (7xxxec serial cards, 7106e, Relio R1)?

Aug 19th 2020

The following devices are based on the XR17V35X and are known to be impacted by the GPIO configuration issue described in this article:7xxxec serial cards7106eRelio … View More

FAQs

General Information

Conflict Minerals Report

Nov 6th 2019

Sealevel Systems, Inc. is committed to the responsible sourcing of minerals within our supply chain. Please refer to the document below for our Conflict Minerals Repo … View More

General Questions

FAQs

Sealevel Statement on Chinese Trade Tariffs

Jun 1st 2019

Sealevel is reluctantly forced to deal with the realities of the trade war with China by imposing a nominal 2% tariff recovery fee on all standard product orders, ef … View More

FAQ

Cloud I/O

FAQ: Can the electromechanical relays on the SeaConnect 370 reliably switch a micro-current signal after switching a medium load?

Sep 20th 2017

No, they cannot. Medium loads wear through the contacts’ gold plating, which is what enables the micro-current switching capability. Beneath the gold plating i … View More

FAQ

Cloud I/O

FAQ: What’s unique about the relays used on the SeaConnect 370?

Sep 20th 2017

The new Sealevel SeaConnect 370s incorporate innovative Form C electromechanical relays with gold-plated bifurcated contacts. These relays provide lower initia … View More

FAQs

Serial

Can Sealevel synchronous serial expansion boards and Relio R2 Sync Server communicate using SDLC or HDLC-derived protocols?

Jan 20th 2017

 Sealevel synchronous serial expansion boards and the Relio R2 sync server have an SDLC mode that implements many low-level behaviors of SDLC such as frame open … View More

Digital I/O Faqs

FAQs

What could cause an error from my first SeaMAX I/O function call?

Jan 20th 2017

An error can occur in the first SeaMAX I/O function call if a SeaMAX function call that is necessary to set up the communication with the I/O device is either mis … View More

Digital I/O Faqs

FAQs

How do I interpret error return values from SeaMAX functions when debugging my SeaMAX program?

Jan 20th 2017

The SeaMAX API Documentation is the go-to source for understanding the error return values of a SeaMAX function. The SeaMAX documentation for each function provides i … View More

Asynchronous Serial Faqs

FAQ

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

Nov 1st 2016

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 … View More

FAQ

FAQs

Can I use Sealevel synchronous serial adapters with Linux?

Nov 1st 2016

Sealevel SeaMAC software is used to enable Linux support for products which feature the Zilog® Z85230 Enhanced Serial Communications Controller (ESCC). Our Route … View More

Asynchronous Serial Faqs

FAQs

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

Oct 18th 2016

 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 rem … View More

Asynchronous Serial Faqs

FAQs

When should I use the RFC 2217 mode of my SeaLINK Ethernet serial server?

Oct 18th 2016

 RFC 2217 is a popular protocol for accessing serial ports over a network. A server that uses RFC 2217 allows its serial port to be controlled through the n … View More

FAQs

Serial

How do I configure a synchronous serial PCIe or PCI card for loopback testing under Windows?

Sep 16th 2016

 The WinSSD utility of SeaMAC for Windows gives you access to all the communication options of Sealevel PCIe and PCI synchronous serial cards necessary to creat … View More

Digital I/O Faqs

FAQs

How should I connect an optically isolated input and voltage supply to a dry contact output?

Sep 16th 2016

Sealevel’s SeaI/O modules are a good choice for this application. For example, using a SeaI/O-430 module with 32 isolated inputs, we can connect the dry contact out … View More

FAQs

Serial

How does the SeaMAC Configuration Utility help me develop a new application that uses the SeaMAC for Windows API?

Sep 3rd 2016

The SeaMAC Configuration Utility lets you easily configure a Sealevel synchronous serial port to the communication options you select. By using the utility to chan … View More

Digital I/O Faqs

FAQs

What type of relay should I use to control a 24 VDC solenoid?

Sep 3rd 2016

The Form C relays contained in many Sealevel digital I/O products are the best choice for switching highly inductive loads like solenoids. Other relays, … View More

Digital I/O Faqs

FAQs

What is “Flyback Voltage” and what should I do about it?

Sep 3rd 2016

A “Flyback Voltage Spike” occurs when the supply current to an inductive load such as a solenoid is interrupted. Any switching circuit for highly inductive load … View More

Asynchronous Serial Faqs

FAQs

What is Slew Rate Limiting and when should I use it?

Apr 13th 2016

Slew rate is a measurement of how fast the signal voltage changes over a specified period of time. At high data rates, you need a fast slew rate to ensure that the … View More