\
/
●
NPE
0
●
\
●
●
ON-BOARD
MICROPROCESSOR
●
●
/
●
●
NPE
1
A
PORT
CIRCUIT
0
ASYNCHRONOUS
PXT.O
PROTOCOL
DATA
PXR.0
HANDLER
UNIT
TXT.0
(OATMEAL)
(ADU)
TXR.0
A
PORT
CIRCUIT
1
A
PORT
CIRCUIT
2
BUS
ISOLATION
●
\
A
PORT
CIRCUIT
3
●
●
●
A
PORT
CIRCUIT
4
●
●
●
A
PORT
CIRCUIT
5
●
●
BIT
CLOCK
●
A
PORT
●
CIRCUIT
●
6
A
PORT
PXT.7
CIRCUIT
PXR.7
7
TXT.7
TXR.7
TO
ADUs
/
Figure 3-12. Unique Data Line (TN726) Circuitry
3-25