29
The Advanced
®
3D3/4D3 Service Manual
Signal Pin Direction
Carrier Detect 1 to 3D3/4D3
Receive Data 2 to 3D3/4D3
Transmit Data 3 from 3D3/4D3
Data Terminal Ready 4 from 3D3/4D3
Signal Ground 5 common
Data Set Ready 6 to 3D3/4D3
Request to Send 7 from 3D3/4D3
Clear to Send 8 to 3D3/4D3
Note that your instrument is only designed to
support unidirectional communication with an
external device. At this time, there is no pro-
tocol for bidirectional communication.
For a sample RS-232 Port Setup, please see
the RS-232 Supplemental Information in the
Appendix at the end of this user’s guide.
Note: This instrument requires the use of a
null modem RS-232C cable. There are
several variations on null modem
cables. Advanced Instruments recom-
mends that you purchase a RS-232C
cable direct from our factory.
Supervisor/Operator Keyswitch Interface:
A peripheral interface adapter is used to inter-
face the supervisor/operator keyswitch to the
microprocessor.
Head Transition Board (M20450) Descrip-
tion: The stir/freeze coil and the sample
probe are connected to the head transition
board which allows easy sample probe
replacement.*
Head Sensor Board (3D3380) Description:
This board provides two optical sensors that
interface to a peripheral interface adapter on
the main board. These two sensors detect the
head-up and head-down conditions.**
Keypad Transition Board (FLO520)
Description: This board provides the inter-
face to the keypad along with pull-up resistors
for the keypad LEDs.**
Printer Power Outlet
The 3-pin DIN socket, located on the back of
the instrument, supplies up to 1 Amp at 12
VDC via the following connections:
Pin 1 (left) +12 VDC
Pin 2 (center) not connected
Pin 3 (right) ground
* 4D3 cryoscopes that have a suffix before
"E" and 3D3 osmometers that have a suf-
fix before "C" do not have the head tran-
sition board.
** 4D3 cryoscopes without a suffix do not
have the head sensor board or the keypad
transition board.
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