![]() ![]() ![]() RJ45 just adds one conductor on each side, so the numbers should be: 1 – NC 2 – NC 3 – RD 4 – GND 5 – GND 6 – TD 7 – NC 8 – NC And on the DB9 side, using the standard colors: 1 – Blue 2 – Orange 3 – Black – 2 4 – Red – 5 5 – Green – 5 6 – Yellow – 3 7 – Brown 8 – White Both red and green wires need to be grounded to pin 5. The RJ11 to DB9 is: 1 – NC 2 – RD 3 – GND 4 – GND 5 – TD 6 – NC I don’t have the colors for the wires coming from the RJ11, unfortunately. The RJ45 version should conform to this, as the RJ11 plug will also work with telephone cords that have four conductors. The actual order doesn’t matter, but you can use Green-Blue-Orange-Brown (which recalls the EIA standard), and Brown-Orange-Blue-Green at the other end. On one end, they’re arranged in order, and at the other end, in reverse order. What I did was clip the white wires, leaving the colored ones. If the equipment needs to be rearranged, and the cable is lost, it’s likely someone will recall that it looked like phone cord, and use phone cords to re-establish the connection. The reason for using a rolled cable or phone cord is that it’s totally standard. It’s easiest to use the plugs with only enough room for 4 wires, as that’s all you need. In between these, you use phone cord, or in my case, some Cat-3 and RJ11 modular plugs. You construct them by pushing the gold “holes” into the holes, which are numbered 1 to 9. I got some cool looking black ones from Fry’s, but now regret it – you can’t write in black Sharpie on black plastic:(. Here’s what they look like: (pics from ) They appear to have putty colored ones. They come in both DB9 to RJ11 and DB9 to RJ45 forms. Instead of using a traditional serial cable – aka, a “null modem cable”, we use these adapters. It’s a null modem cable without flow control. Toward the end, there’s a diagram of the pinouts for the cable. Pinout of Serial Printer (9-25) Epson cable and layout of 9 pin D-SUB female connector and 25 pin D-SUB male connectorFor most of models Epson printers. ![]()
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