I have a Brother IntelliFAX 2400ML (model PPF-2400ML) with a jack on the back labeled PC I/F. It supports an optional kit called the Missing Link, part number PCI-1, which allows you to use this fax/copier for printing and scanning as well. That kit number (PCI-1) also seems to be referred to as the Multi-Function Link with Brother's Multi-Function Center line of products.
I have the updated version of the software (Y2K compliant and supporting Windows 95/98/Me and maybe 2000), and I want to build the cable from on-hand materials or use a rare-but-standard cable. (This old machine works and I'd like to expand its abilities, but it is not worth putting more than a few dollars into.)
I have been able to learn that the OEM cable has a DB25 plug on one end and attaches to the computer's serial port (the kit also includes a DB-25 to DB-9 adapter). On the end that attaches to the Brother's PC I/F jack, it is an 8-pin module, the same as a network RJ-45 plug. (Is there an RJ-8 specified for serial communications?)
There are apparently some standards for connections like this, if Brother decided to use them and not do something proprietary. RS232 candidates: EIA/TIA 574 (RS-232 ) Defines RS232 with DB9 connectors EIA/TIA ??? (RS-232C) Defines RS232 with DB25 connectors EIA/TIA 561 (RS-232D) Defines RS232 with RJ45 connectors ("8 position modular connector")
I tried connecting fax to computer with a couple old AT&T phone equipment adapters/cables that are 8-pin modular on one end and DB25 on the other, but the Missing Link software did not see the fax over those connections. I don't know how those AT&T pieces are wired.
Does anyone know anything more about this cable?