This adapter allows a PC with one
or two serial ports to non-intrusively monitor a 25-way RS232
designed for use with our
FSA32 PC based serial
data analyser, when running on a PC with two serial COM ports; but is also suitable for similar applications.
It differs from our other PC
adapters by providing extra connections to the PC serial COM port. These allow
the PC application to transmit to line, and to monitor and set the most commonly
used RS232 control lines.
picture for larger view)
- Allows a PC with one or
two serial COM ports to non-intrusively monitor a 25-way RS232 interface
- Provides a connection
for the PC to transmit data to line
- Provides connections for
monitoring DCD, DSR, CTS and RI control lines
- Allows PC to set RTS and
DTR control lines
- Provides full 25-way
through connections to the interface being being monitored
- Has a 2-way switch to
allow RD line to be switched to a second COM port, allowing "full-duplex"
- Has three 3-way switches
to allow TD, RTS and DTR lines to be left floating or switched to
alternative COM port output positions
For PC's with one COM port, one of our
adapters may be more suitable (click here).
FLLBOB adapter, two DB25 way
male to DB9 way female cables (for connection to PC ports), 12 months warranty,
lifetime support by phone or email
|Order code: FLLBOB
||£125.00 + VAT (UK)
Monitoring an RS232
The FLLBOB adapter is connected
to the monitored serial line via the RS232 IN/OUT connectors, shown at the top
and bottom of the picture above. (That at the top is a DB25 female connector,
the other a DB25 male connector). These connectors have a full 25-way through
connection and do not affect the monitored line.
PC with one COM port - this is
connected to the "PRIMARY PORT" connection, shown on the right of the picture
above. In this case either line 3 (monitored line RD) or line 2 (monitored line
TD) may be switched through to the primary port for monitoring, but not both.
However it does allow the control lines listed above to be monitored.
PC with two COM ports -
connection is made both to the "PRIMARY PORT" connection, shown on the right of
the picture above, and to the "SECONDARY PORT", shown on the left hand side. In
this way both line 3 (monitored line RD) and line 2 (monitored line TD) are
connected to the PC.
Transmitting to line
This is usually carried out in
"Active" mode, when one COM port of the PC is directly connected to one
equipment. Using the FLLBOB adapter rather rather than a direct connection is
useful in this in this mode, because the switches on the FLLBOB can be used to
provide a "crossover" connection, where the transmit line from the equipment is
connected to the receive line on the PC, and vice-versa.
FLLBOB PRIMARY PORT connections
||2 or 3
||2 or 3 or
||4 or 5 or
||6 or 20 or