Do not mix different wiring specifications within the same wiring installation. Crossover Cable. Some applications may require a crossover cable. The most common use of a crossover cable occurs in wiring together two Hubs. Pins 1 and 3 are crossed over, and Pins 2 and 6 are crossed over.
Connecting RS equipment to a control system can sometimes require soldering or using cables that are too long for the job. Make your next install faster and neater by using this DB9-RJ45 adapter.
Note: Note, this adapter has female DB9 with a null modem pin-out configuration. We received an email recently pointing out some issues with NULL modem cables. The pinouts shown below will generally work. One end may expect something a signal that the other end cannot generate.
If you suspect this is the case then unfortunately you need to understand the interface and may have to 'spoof' artifically create certain signals. Our signal primer page may help you. Finally, if you are having serious problems, splash out on what is frequently called a 'light box' or some other device that will show you which signals are being activated.
All the diagrams below define the interface from the DTE perspective. We use DCD throughout 'cos we think it's more common. For all practical purposes RS and V. Like most folks we use the term DB9 which is widely - but erroneously - coined to describe a 9-pin serial connector.
We got an email pointing out the error of our ways hint: it is really a DE-9P. So, if you want to amaze your friends over the dinner table, you can read more and use the technically correct terms in the future.
RSE is normally defined to be used with a DB25 connector, but does have a 26 pin a much smaller alternative. We suggest that if you come across one of these that you do the decent thing - use an expletive. Alternatively, with your luck, you could consider buying a lottery ticket.
We guess there is a lot of LAN cable lying around these days and its cheap so folks naturally want to use it. We have added a null modem only section to cover this wiring. There is absolutely no standard to cover this form of wiring. This section is simply offered as one of many possible ways to do it. While we are on the topic of wiring, RS does not define a cable standard but this may help in choosing a suitable cable. We got an email asking about TTY 20ma current loop interfaces.
This was an old method used to connect teletype devices and uses current normally 20ma but sometimes 60ma to indicate mark and space. You will need to get the manufacturer's specifications and start reading!
RS is probably the most widely known serial standard because of its use in PCs. We will continue to use the RS term simply because we think it is still more widely used and because old dog, new tricks When PCs are connected back-to-back each end is acting as a DTE there is no DCE in this case and consequently certain signals may have to be looped in the connection to satisfy any input signal requirement.
This is called a NULL no modem configuration. This is shown in the diagram below. These diagrams show the male grey background and female black background pin numbering for DB9 and DB25 sub-miniature connectors. Generally Pin 1 is marked on the front of the connector right next to the pin - though you may need a magnifying glass to read it. Some manufacturers mark each pin number on the plastic housing at the rear of the connector. The male connector has the pins sticking out!
The RS DB25 connector is capable of supporting two separate connections - each with its own optional clock when used in Synchronous mode or Bit-Synchronous mode. If you are using the interface purely for Asynchronous communications then you only need those marked with ASYNC below or you can use even fewer if you understand what is happening. This took about minutes to complete. Once the update finishes, the UPS will power-off completely. You need to check the back of your UPS for plastic tabs which protrude from the expansion slot.
An easy way to tell if a card will fit into a SmartSlot 2 is to look for the vertical cutouts on the NMC itself next to each screw hole as pictured below. Pages: [ 1 ] Go Up. Connecting both DB9 pins 6 and 1 to RJ45 pin 3 is also easy. The astute will note we have a potential disaster here.
Let's say we clip the wire from RJ45 pin 1 as close to the DB9 pin as possible, strip it a bit, then wrap it around the DB9 pin connected to RJ45 pin 2. It's going to be a little shorter, but will probably work.
Now let's move onto the next tie. But we have even less room to work on this and no wire. You'll need this extra wire because when you push the DB9 pin into the hole none of the brass pin remains visible. But go back to that Cisco cable pinout. They ignore the CD signal and their cable works just fine.
So for the easy solution that avoids clipping, stripping and soldering maybe we can just ignore CD as well. Well, that's a lot easier.
It's not standard, and it may fail in strange ways, but if it works for us then we're okay with that. Note that the previous caveat about clearly marking non-standard cables still applies. Make sure anyone looking at this connector knows something odd has been done to it. Using the Cables To Go part you can follow the color coded guide below.
0コメント