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11 11. How can two serial devices communicate without using a PC?

The simplest method is to use a null modem cable (Item# CA213), which reverses the transmit and receive signals between the serial devices. This method only works for short distances. For distances over 50 feet, a better method is to use a pair of Sealevel…

12 12. 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…

13 13. How does the performance of Sealevel Ethernet serial servers compare to native serial ports?

Sealevel Ethernet serial servers are designed to mimic the behavior of native PC serial ports. Legacy software can communicate with the Ethernet serial server’s virtual COM port as though it was connected to a native COM port.

14 14. 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.…

15 15. Why do I need to connect a ground line when using RS-422 or RS-485 communications?

By connecting the ground wire, you avoid potential communication problems. Differential serial communications such as RS-422 and RS-485 use the ground as a reference. When there is no ground, the reference is basically floating. Communication failures can…

16 16. When do I need optical isolation?

Using an optically isolated serial device alleviates the problem caused by ground loops, floating grounds, or small surges. Sealevel offers a variety of optically isolated serial products including the following interfaces: USB 2103 – 1-Port RS-232 DB25…

17 17. Do I need to terminate modem control signals if I'm not using them?

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…

18 18. 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…

19 19. Will a standard RS-232 DB25 to DB9 adapter or cable work with my RS-422, RS-485 board?

No. Standard DB25 to DB9 adapters and cables are made to convert an RS-232 DB25 pin out to an RS-232 DB9 pin out. As such, they do not pass the correct signals through for RS-422 or RS-485. Please see the following question regarding using standard RS-530…

20 20. Will RS-530 serial devices work with Sealevel RS-422 or RS-485 serial interfaces?

Yes. An RS-530 to RS-422/485 interface cable will be required to match up the signal pin outs of the interfaces. Use the CA176 cable to connect the DB25 connector of an RS-530 device to the DB9 connector of a Sealevel RS-422/485 serial port.

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