Equinox Systems MEGAPORT Hardware Reference Manual page 38

Note: When making modular adaptors, the 3K resistor shown
in Figure 3-10 may be eliminated for use with most terminals.
The resistor is used to loop control signals back to the attached
device when 4-wire cable is used and pin 6 is not connected.
When using 6-wire cable and there is a voltage on pin 6, the
resistor has no effect and the voltage on pin 6 is passed
through to the attached device.
FM Modular Adaptors
FM modular adaptors (see Figures 3-12) convert 10-pin RJ-45
modular jacks to DB-25 or DB-9 (RS-232) connectors. Some software
applications require the use of the Data Set Ready (DSR) signal. For
applications requiring DSR, use one of the following modular
adaptors or it's equivalent.
Part No.
210068 DB-25 DTE male
210069 DB-25 DTE female
210070 DB-25 DCE male
210071 DB-25 DCE female
210072 DB-9 female
Note: If the application does not require DSR, an 8-wire RJ-45
cable may be used.
32
Connector Connect To
modems or multiplexer channels (female DCE )
Male DCE devices (non-standard devices)
terminals or ports (female DTE )
terminals, ports, personal computers (male DTE )
personal computer serial port
Equinox MEGAPORT Hardware Reference Manual