What are some common concerns when installing serial cables?

  Make sure connections are clean and secure and thumbscrews are tightened If running long distances, choose a low capacitance cable Avoid running communication cables near AC power lines, fluorescent lights, motors, transformers or any devices with a strong magnetic field High-quality shielded cables are included with certain Sealevel serial devices and are also available […]

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What are the advantages of using an advanced UART?

  The primary benefit of a 16850 UART (standard on most Sealevel products) is a 128-byte FIFO buffer that prevents data loss in high-speed serial communications. The optional 16950 UART provides the following benefits: 8x more baud rates due to 1/8th clock prescalar 128-byte FIFO buffer 9-bit protocol support Isochronous mode Contact your sales representative […]

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What is “Serial Tunneling”?

  Serial tunneling works by pairing two Sealevel Ethernet Serial Servers (located on the same subnet) together by configuring each others’ IP address. When one serial server receives serial data, it converts the data to network packets and transmits it to the other serial server. The receiving serial server strips the network information, converts it […]

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

  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 data is received accurately. At low data rates, an unnecessarily fast slew rate can introduce EMI (electro-magnetic interference) on the signal lines. […]

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What is the ‘Gen Mod’ that Sealevel recommended?

  ‘Gen Mod’ is an abbreviation of ‘Generic Modification’ and it ensures that the COM port assignments on a USB serial adapter are always the same, regardless of which physical serial adapter is connected to the USB port on the host computer. It is ideal for environments where a single computer is used to communicate […]

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

  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 Telnet Com Port Control protocol so they also send control sequences and certain bytes in a Telnet compliant manner. Every Telnet control sequence begins with the “Interrupt As Command” (IAC) byte, […]

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What kind of cable should I use for RS-485 communications?

  A good economical solution for field wiring is to use CAT5 or CAT6 twisted pair cable. Connect each twisted pair to the same set of signal pins – TX+/TX- would be one pair of conductors, RX+/RX- another pair of conductors, and GND a third pair of conductors. This helps to cancel out noise or […]

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