Register's Description Rs232/Rs485; History And Monitor Status - Kontron cPCI-MXS64GX Technical Reference Manual

3.1.3. Register's description RS232/RS485

CPLD Address
READ n90h*
WRITE n90h*
Power-up Default
ST1 : Enable RTS2 to be used as 485TX ENABLE when in 485 mode
RS232 : Enable UART2 RS232 operation
RS485 : Enable UART2 RS422 and 485 operation
The serial port 2 mode can be controlled by setting three bits. Here are the possibilities.
RS232
RS422
RS485
X : Don't care

3.1.4. History and monitor status

CPLD Address D7
READ n91h*
WRITE n91h*
Power-up Default
PFO : Read the external power fail flag
PBRST : When high, indicate that the last system reset was caused by push button reset
switch
WDO : When high, indicate that the last system reset was caused by watchdog time out
D7 D6
NU NU
NU NU
Mode Bit RS485
0
1
1
D6
PBRST NU WDO
NU NU
D5 D4 D3
NU RS485 RS232
NU RS485 RS232
0 1
Bit RS232
1
0
0
D5 D4 D3
NU NU
NU NU NU
3.3
Installing the Board
D2 D1
ST1 NU
ST1 NU
0
Bit ST1
X
0
1
D2 D1 D0
NU NU PFO
NU NU NU
D0
NU
NU