G.R.A.S. Sound & Vibration
Sound-intensity Probe Type 50AI - Page 12
3.
Output Socket
The pin connections of the LEMO output socket at the base of the Type 50AI are shown in
Fig. 3.1. The four inner pins, i.e. 9, 10, 11 and 12 are for enabling a dialogue between a user
and an analyser/computer via an RS232 port. They are used to:
a) Transmit the state (pressed/not pressed) of the two push buttons on the handle of the Type
50AI
When pressed:
the blue button transmits
Data Set Ready
the grey button transmits
Clear To Send
b) Signal the responses via the two LEDs also on the handle of the Type 50AI
When lit:
the red LED is signalling
Request To Send
the white LED is signalling
Data Terminal Ready
By suitably programming the analyser’s/computer’s software, measurements and data acquisi-
tion can be controlled interactively via the push buttons and LEDs.
Fig. 3.1 12-pin LEMO female socket 1B (external view). The
four inner pins are for connecting directly to an RS232
computer
port
Fig. 3.2 9-pin female D-sub connector socket of the Power
Module Type 12AB for connecting directly to an RS232
computer
port
(external
view)
3.1
Use with Power Module Type 12AB
If the Type 50AI is used with a G.R.A.S. Power Module Type 12AB, pins 9, 10, 11 and 12
(Fig. 3.1) automatically have an outlet via the RS232 port of the Type 12AB (see Fig. 3.2) for
further connection to an analyser/computer.
