Cables - Comtech EF Data KPA-020IN Installation And Operation Manual

Ku-Band Solid-State Power Amplifier
Remote Control
6.4

Cables

RS-232
The remote control port is configured with pin 2 as the TX data signal (TD) and pin 3 as
the RX data signal. This arrangement allows straight connection (pin 2 to pin 2 and pin 3
to pin 3) between the KPA and most standard serial ports using any standard RS-232
cable (i.e. no need to swap pins 2 and 3).
RS-485
RS-485 cabling can be implemented with a single ribbon cable using IDC Mass
Terminated style connectors or with discrete wires using solder-cup style connectors. A
sufficient length of ribbon cable must be allowed to reach the system monitor and control
computer.
RS-232
RS-485
The Comtech EF Data KPA does not require the hardware handshaking
provided by the DSR, RTS, and CTS signals. These signals are provided for
customers that are using interface terminals that require this handshaking. Most
of today's PC's are provided with RS-232 serial ports that do not require the
hardware handshaking. In these instances, the interface can be reduced to three
signals; TD, RD, and GND.
Both 2-wire and 4-wire applications are supported. The 4-wire interface
provides independent signal wires for each of the RX (+RX) signal and its
complement (-RX) as well as the TX (+TX) signal and its complement (-TX).
In the 2-wire interface, the RX signal and the TX signal (+RX/TX) share one
wire and likewise the complement signals (-RX/TX) share one wire. Choice of
2-wire vs 4-wire is based on the customer's interface equipment and the cabling
between this equipment and the KPA(s).
2-wire Each signal pair (+RX/TX and –RX/TX) is provided on two pins. This is done
to provide customers who are using solder-cup type DB-9 connector the ability
to more easily daisy chain the signals to multiple devices while maintaining one
wire per solder-cup. Customers who use IDC Mass Terminated style DB-9
connectors (Ribbon cable types) need only use three signals.
4-wire All five signals are required.
6-3
Revision 0
MN/KPA.IOM