6.5
BD4000 Rear Panel Section
DUART
, Dual Universal Asynchronous Receive Transmit, controls the data flow to and
from the microprocessor and converts it into a protocol accepted by the RS232 IC.
Level Converter
, this converts the data from the DUART into RS232 voltage levels.
The RS232 link allows data to be passed from and to an external device via the rear
panel D-type connectors.
Twins Detect
, detects when the twins lead connector marked '1' is connected, to place
the unit into twins mode (LOCAL).
The BD4000 connected to the other end of the twins cable becomes the REMOTE unit.
Synchronisation signals
, synchronises the two ultrasound transducers when connected
in twins mode.
Port 1
, when used in twins configuration sets unit to ‘Local’ mode by monitoring Twins
Detect. US timing is set by ‘Remote’ unit and FHR information is received from the
‘Remote’ unit.
Port 2
, when used in twins configuration sets unit to ‘Remote’. US timing of ‘Local’
unit is set by ‘Remote’ unit and FHR information sent to the ‘Local’ unit for display and
printing.
Issue: 2 DRAFT
23
Rev: a
614365
SYNC/Gate In
Carrier Out
SYNC/Gate Out
Twins Detect
Carrier In
RS232
RS232
