Uwestermo
With the KX-1
COM DETECTIVE
you have access to
the full interface of
the computer, terminal
or modem. It is possible to
check the condition, interrupt
- the signals, set signals at fixed
level, cross-patch, measure and
check signal levels. In short, the KX-1
Is an invaluable aid in trouble-shooting when
setting up, and when putting terminal systems
into operation.
The KX-1 can be used for interfaces according to CCITT
V.24/V.28 and EIA RS-232C. All 25 pins are accessible. The
state of the most important signals can be monitored on 10 LED's.
lt is also possible to check the level of just any signal by means of two further LED's. All
signals can be interrupted via the DIP switches.
The KX-1 is housed in a rugged plastic case with a faceplate of anodized aluminium.
Four jumper wires for cross-patching (three are single pressed, and one double pres-
sed) and battery are included. On the back of the box there is a table listing all signals
and pins in the interface according to CCITT and EIA recommendations. The KX-1
comes complete with carrying case.
SPECIFICATION
Interface: CCITT V.24/V.28 and EIARS-232C
No. of LED's: 12
Switches: 25 DIP switches plus one three-position switch for battery and
signal level check.
Dimensions: 146 x 95 x 25mm
Weight: 250 gr. approx.
Battery: OV, Type 6F22
/WesTermo
WESTERMO TELEINDUSTRI AB
5-640 40 ST. SUNDBY SWEDEN
Tel: 016-612 00 Telex 461 17
We reserve the right to change specifications without prior notice.
DESCRIPTION
The KX-1 has three main functions:
- Monitoring signal conditions. Indication via the LED's.
- Measuring on test points. All signals on each side of the interface are
accessible.
- Cross-patching of signals within the interface. For operation, fault-finding
and experimentation.
Switches
The three-position switch on the KX-1 has the following functions:
- BATT position: Check of battery condition. With a fresh battery the LED
“Level+” should light. If not, replace battery. (accessible from back).
- Centre position: Normal position.
- LEVEL CHECK position: For measurement of signal level: see further under
"Interface monitoring” below.
For each and every one of the 25 pins in the interface there is an on/off switch,
each marked with the respective pin number. With ON the signal passes through
the KX-1. With OFF the signal path is broken.
INSTRUCTIONS FOR USE
The three-position switch should be in the centre position both when in use and
when not in use. The interface will function even if the switch is in the other
positions, but there will be unnecessary drain on the battery.
h
Interface monitoring
Connect the KX-1 between the DTE (usually a terminal or a
computer) and the DCE (usually a modem). See that any
cross-connections are removed and all switches in the ON
position.
With data traffic, LED's 2 (TD) and 3 (RD) should flicker, and
some of the other control signal check LED's should light or
blink.
Signals which do not pass over an LED can be checked by
connecting a jumper wire from that pin to pin J3 (LEVEL). The
LED's marked + and - show the signal state. They also
indicate whether a signal exceeds +3V (LED”+” lights up), or
if it less than -3V (LED”-” lights up). With precision mea-
surement, set the three-position swith to "LEVEL CHECK”.
One of the two LEDs are always lighted and the latest signal
condition always remains indicated.
Cross-patching
Most of the connections between a terminal (DTE) and a
modem (DCE) are pin-to-pin compatible i.e. pin 2 to pin 2, pin
3 to pin 3 etc.
It can sometimes be necessary to change a connection in a
cable by breaking up and cross-connecting leads. This can
easily be done with the KX-1 without the need of a soldering
iron. If a computer is connected directly to a terminal (two
DTE's to one another) it is necessary, for example to cross-
connect pins 2 and 3. This is easily done by breaking up the
two signals by switching to OFF pins 2(TD) and 3(RD) and
connecting two jumper wires, one from pin 2 on the DTE side
to pin 3 on the DCE side, and one from pin 3 on the DTE side
to pin 2 on the DCE side.
We reserve the right to change specifications without prior notice.
Forcing a signal high
It is sometimes necessary to force a signal high. If, for
example, the signal DTR is missing from the terminal, but
required by the modem, it can easily be forced high via the
KX-1. Just connect a wire from J4 (+9V) to that pin which
needs to be set high.
Loopback
The KX-1 is ideal for carrying out digital loopback tests. If, for
example, there is a fault in a communication line, but it is not
known whether the fault is in the line, the terminal or the
modem, then it can be convenient to carry out a loopback
test on the modem. Connect the KX-1 to the 25 pin connec-
tion on the modem. Do not connect the terminal. Carry out
the signal loopback on the DCE side by connecting Receive
Data to Transmit Data (pin 2 to pin 3), connect Data Set
Ready to Data Terminal Ready (pin 6 to pin 20), and with the
double pressed jumper wire connect together Request To
Send, Clear To Send and Data Carrier Detect — (pins 4, 5 and
8). Send data to the modem from the other end of the
communication line. Via the KX-1 the data is reconnected to
the transmitting unit where the check for fault can be carried
out не same time, the signal status can be checked via
the 'S.
The terminal can be checked in the same way. Connect the
KX-1, retaining the same connections. The data from the ter-
minal is now returned to the terminal. If the terminal is a VDU
for example, then it can be checked on the screen that the
data received is the same as'that sent. *
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/westermo
WESTERMO TELEINDUSTRI AB
5-6040 40 ST. SUNDBY SWEDEN
TRYCK Vásterás 1986.05
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