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Asynchronous Serial Faqs

FAQs

What is the extra data transmitted between Sealevel Ethernet Serial Servers and the SeaLINK driver?

Apr 29th 2011

 The extra data is non-serial Telnet command messages such as COM port settings and modem control signals. SeaLINK devices communicate using the RFC-2217 … View More

Computing

FAQs

In Windows XP Embedded, what components and drivers are required to add multiport serial adapters?

Apr 29th 2011

 For proper enumeration of Sealevel multiport serial adapters, the following components must be included in the Microsoft Windows XP Embedded OS image build:&ld … View More

FAQs

Serial

How do Sealevel synchronous serial adapters handle Manchester clock encoded data?

Apr 2nd 2011

 Manchester clock encoding (also known as split phase or bi-phase level encoding) always produces a transition at the center of the bit cell.Sealevel synchron … View More

Asynchronous Serial Faqs

FAQs

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

Apr 2nd 2011

 To optimize a SeaLINK Ethernet serial server for lower latency, disable Nagle’s algorithm on both the SeaLINK device and virtual COM port driver. … View More

Asynchronous Serial Faqs

FAQs

Why is my Ethernet serial connection timing out or not responding fast enough?

Apr 2nd 2011

 By default, SeaLINK Ethernet serial servers use Nagle’s algorithm to reduce network traffic and increase serial data throughput, with the side effect o … View More

Asynchronous Serial Faqs

FAQs

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

Mar 31st 2011

 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 redu … View More

Asynchronous Serial - Downloads

Downloads by Functionality

Software: WinSSD Diagnostic Utility – Windows

Mar 10th 2011

Downloads: WinSSD for Windows Size: 5.8 MB Type: .exe WinSSD Help FileSize: 3.5 MB Type: .hlp This is the standalone version of the Sealevel WinSSD diagnostic utilit … View More

Asynchronous Serial Faqs

FAQs

How to fix “crazy mouse” syndrome with USB serial adapters

Mar 1st 2011

OverviewThis condition is potentially encountered in Microsoft Windows when connecting a serial GPS device to a serial port. It is caused when the NMEA 0183 GPS … View More

General Questions

FAQs

Can I use my FedEx or UPS account number when I place a web order?

Mar 1st 2011

 Yes. Please include your account number in the ‘Special Instructions’ field and we will bill the freight charges to your account. The ‘Specia … View More

Digital I/O Faqs

FAQs

What is the default power up condition of a Sealevel TTL Digital I/O product?

Mar 1st 2011

All Sealevel TTL Digital I/O products are configured to power up in input mode by default. This ensures that no outputs are inadvertently activated. … View More

Asynchronous Serial Faqs

FAQs

Why does the mouse cursor randomly jump around when I connect a GPS to a Sealevel serial adapter?

Feb 2nd 2011

You are describing the “crazy mouse” syndrome, a common condition when Microsoft Windows receives NMEA 0183 data from a serial GPS device. The conditio … View More

FAQs

Serial

How is the memory accessed on the 3514 and the 5104 synchronous serial adapters?

Feb 2nd 2011

The Zilog 16C32-based 3514 and 5104 have 256 K of memory on the adapters that are used for buffering the input and output data. To aid in transfer efficiency, the Wi … View More

Computing

FAQs

On the SBC-R9 embedded computer, what is the sampling rate for the analog inputs?

Feb 2nd 2011

The SBC-R9 has eight analog inputs with an effective bandwidth of 1.23 kHz divided across all eight analog inputs. The A/D device specifies a maximum sampling fr … View More

FAQs

Serial

What bit order does the Zilog 16C32 chipset use for transmitting serial data?

Feb 2nd 2011

 The Z16C32 operates similar to a UART and transmits the least significant bit first. The only exception is when the card is operating in SDLC/HDLC mode wit … View More

Downloads by Name

Driver Downloads & Software

Firmware: SeaLINK (Ethernet)

Jan 21st 2011

Download SeaLINK Firmware (.s19 680.8 KB) Please refer to the SeaLINK User Manual or contact Sealevel technical support for instructions on updating the firmware on y … View More

FAQs

Serial

Can the BERT pattern be used at data rates above 14.4 Kbps?

Dec 29th 2010

 The ITU document O.153 paragraph 2.1 indicates the BERT pattern can be used at data rates up to 14.4 Kbps. However, the Sealevel WinSSD utility allows the B … View More

FAQs

Serial

What CRC-CCITT value is used by Sealevel synchronous serial adapters with the Zilog Z85230?

Dec 29th 2010

 The CRC-CCITT polynomial value used in the Zilog Z85230 is:x16 + x12 + x11 + x10 + x8 + x3 + x2 + x1 + 1The corresponding hexadecimal value is 0x1D0F.  … View More

FAQs

Serial

What CRC-CCITT value is used by Sealevel synchronous serial adapters with the Zilog Z16C32?

Dec 29th 2010

 The CRC-CCITT polynomial value used in the Zilog Z16C32 is:x16 + x12 + x5 + 1The corresponding hexadecimal value is 0x1021.  … View More