Continuum CPU Reference
17
RS-232
The NetController can be connected to other support devices such as printers for
reports and other PCs used as command terminals. These connections are
accomplished using either of the two RS-232 ports.
Both COMM 1 and COMM 3 include general-purpose RS-232 connections. An
industry standard 8-pin shielded insulation displacement RJ-type termination
connector is provided for the RS-232 interconnection. Although the official
specification defines 25 signals, typically most devices use only eight of these. A full
compliment of these signals are included in both COMM ports.
The following lists the signals provided and their description:
Signal Abbreviation Description
Protective Ground SHLD Connected to the outer shield of the cable
Signal Ground RTN Return for all data signals
Transmitted Data TD Serial data originating at the NetController
Received Data RD Serial data originating at the connected
device
Data Terminal Ready DTR NetController signals it is operating
Data Set Ready DSR External device signals it is operating
Clear to Send CTS External device signals it is ready for a
transmission from NetController
Request to Send RTS NetController signals it wants data from
external device
Data Carrier Detect DCD External device (usually a modem) signals
that it is communicating with another device
and is ready for operation
Power
Suppl
NetController
I/O
I/O I/O
Printer
PC
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