1. General
As implied by its name, the 6150AD probe connector serves for connecting external probes to the
6150AD. However, the probe connector offers additional features, especially to read the 6150AD
instrument by a computer (which is used e.g. by the Automess Dose Rate Acquisition Systems
DES11/12/13). This manual shall provide information to 6150AD users how to use the output signals for
own applications. Throughout this manual it is assumed that the reader is familiar with the operation of
the 6150AD series instruments.
Pin assignment of the probe connector is as follows:
Contrary to e.g. sub-D connectors the pins are not numbered on the body of the connector due to lack of
space. Instead the six pins were given the names indicated above (which are names taken from the
schematics of the 6150AD). All further discussions of the signals will refer to these names. The colours in
parentheses are those of the wires in the Automess standard probe cable. So the easiest way to access the
signals for testing or for connecting some user equipment would probably be to cut a standard probe cable
into two equally sized pieces, which would give two test cables at a time.
The purpose of the signals is listed below an will be discussed in more detail later:
GND
Ground potential. Note that there is no pin for GND. The cable shield serves both as shield
and as ground connection. The aluminium housing of the 6150AD and the AD probes is
electrically equal to GND.
4.75V
Supply voltage for external probes. Identical to supply of 6150AD internal electronics.
PL, S/E
Signals needed for serial readout of probe data (probe type and calibration parameters). PL
(»parallel load«) is an output used to load these data into a shift register. S/E
(»Senden/Empfangen« = »transmit/receive«) is a tri-state bidirectional line used to clock
and read the shift register.
Ext
Pulse input from external probes. External pulses will only be counted if an external probe
was recognized through lines PL and S/E.
Term
Serial output similar to RS232 (»terminal«) for a periodic readout of dose rate by a
computer.
Control
Output to switch between the two GM counters in the telescopic probe AD-t.
External probes require all lines except Control and Term. The two detector probe AD-t additionally
requires the Control line. Term is not required by any probe.
Term (pink)
Control
(gray)
GND (shield)
4.75V (green)
Ext
(brown)
PL (white)
S/E (yellow)
06/2003
Technical Manual 6150AD Probe Connector
Page 2 of 14
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