This adapter accepts a standard Cat-5 Ethernet cable and converts it to a standard DB-9F RS-232 pinout, for use with the MM-1263 and MM-1264 Ethernet to Serial Converters. This is the crossed or “null modem” version of the adapter. The MM-1269S for the straight-through version. This adapter is most often used with the MM-1220 and MM-1230 series devices, and is included when you buy these from ETR. If you are sourcing similar devices yourself, consult ETR to find out which adapter you need. Generic RJ-45 to DB-9F adapters are widely available, but beware that the color codes used vary between adapter brand. The colors in the pictures above are accurate for the adapters we currently use, and are given in the table below as well. If you get adapters with a different color scheme, use the pin numbers instead, using the pin 1 indicators in the picture above.