12/17/2022 0 Comments Smart serial to rj45 dte![]() ![]() Inside an RJ-45 adapter, coming from the RJ-45 socket there are 8 wires with male (or female) DB-25 (or DB-9) pins crimped onto them. If you're trying to get maximum length and/or highest speeds, be sure to heed the section above on "twisted pair cable". Ha! In practice, lenghts of 800 to 1000 feet work just fine. The RS-232 standard specifies a maximum cable length of 75 feet at 9600 bits per second. The pairing of the remaining wires is not important, but 1:2 and 7:8 will be about as good as any. Other pairings will be susceptible to data signal crosstalk. Rather you should wire them so that wires 3:4 and 5:6 make pairs. If you use twisted pair cable, such as "Category 5" cable, you should not wire your cables as one normally would for RJ-45 (e.g. "Twisted pair" cable, by contrast, has four pairs of wire, each pair twisted against itself along the cable's length. This scheme was intended for use with jacketed ribbon cable, in which all the wires are side-by-side. The biggest caveat to this system is that you'll have to buy or borrow a crimping tool for making the cables. Female to female RJ-45 connectors are also available for extending cable lengths, but remember, two twist cables joined with such a coupler make a straight-through cable. If you buy ready-made cable, it'll be "straight-through", and you'll have to remove the connector from one end and crimp on a new one with the wires reversed (8 to 1 and 1 to 8, etc.). Don't use straight-through cables they won't work at all. this meaning of "twist" is distinct from the use in the term "twisted pair".)īecause of the way the adaptors are wired, the "twist" cable connects each transmit pin to its corresponding receive pin at the other end of the cable. That is, pin 1 at one end of the cable goes to pin 8 on the other end, etc. They are wired " with a twist", or "mirror image", or "side-to-side reversed", or whatever you want to call it. with each connector pin connected to the corresponding pin at the other end of the cable). The control lines are used for modem control and/or hardware flow control. There are three signal wires for each direction: one data and two control. Furthermore, every serial port now transmits and receives data and control on the same pins.Īs of December 2020, this DB25 to RJ45 adapter is a good choice: Hardware Flow Control and Modem Control Now every serial port has the same kind of socket: RJ-45 Female, regardless of whether its underlying connector is DB-25 or DB-9, DTE or DCE, male or female. Onto every serial port of every piece of equipment at your site, you screw down an appropriately-wired adaptor from DB-25 or DB-9 to RJ-45.
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