MIL-DTL-62736A(AT)
3.3.8.10 RS-232-C serial data out. The UART shall send out the serial data by RS-232-C
communications protocol. Each RS-232-C logic level 1 shall be in the range of -3 Vdc to
-25 Vdc between P1-11, P1-12 and P1-15, P1-16. Each RS-232-C logic level 0 shall be in the
range of +3 Vdc to +25 Vdc between P1-11, P1-12 and ground potential.
3.3.8.11 RS-485 serial data in. The UART shall receive serial data by RS-485
communications protocol. Each RS-485 logic level 1 shall be a difference of no less than
+0.2 Vdc but no greater than +12 Vdc between P1-11, P1-12 and P1-15, P1-16. Each RS-485
logic level 0 shall be a difference of no greater than -0.2 Vdc but no less than -12 Vdc between
P1-11, P1-12 and P1-15, P1-16. The voltage between U14 pins 5, 9 and P1-1, P1-2, P1-3 and
P1-4 shall be no greater than +12 Vdc and no less than -12 Vdc.
3.3.8.12 Status and receiver holding registers read. The status and receiver holding
registers shall be read by applying the waveforms of figure 7. The status register shall indicate
when the transmitter shift register is empty, when the transmitter holding register is empty, and
when data is available from the UART receiver holding register.
3.3.8.13 RS-232-C serial data in. The UART shall receive serial data by RS-232-C
communications protocol. Each RS-232-C logic level 1 shall be in the range of -3 Vdc to
-25 Vdc between the input line (P1-15 and P1-16) and ground potential. Each RS-232-C logic
level 0 shall be in the range of +3 Vdc to +25 Vdc between the input line (P1-15 and P1-16) and
ground potential.
3.3.8.14 Error recognition. The UART shall detect overrun, parity, and framing errors of
incoming serial data and shall signal these errors by setting bits of the status register according to
table XVI.
TABLE XVI. Status register flags.
P1-
Flag
28
27
26
25
24
23
22
21
Overrun error
X
X
0
0
0
0
1
1
Parity error
X
X
0
0
0
1
0
1
Framing error
X
X
0
0
1
0
0
1
(X denotes a don't care condition)
3.3.8.15 RS-485 self test. The I/O PWA shall enable both the RS-485 driver and receiver
at the same time to route serial data output from the UART back in as serial data input to verify
communications sending and receiving capabilities.
3.3.9 Automated testing equipment (ATE) test. The PWA shall pass TACOM approved
ATE test installed in TACOM approved ATE or equivalent.
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