Register's Description Rs232/Rs485; History And Monitor Status - Kontron CPCI-MXS 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.
Mode
RS232
RS422
RS485
X : Don't care

3.1.4 History and Monitor Status

CPLD Address D7
READ n91h* PBRST
WRITE n91h* NU
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
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D7 D6 D5 D4
NU NU NU RS485 RS232
NU NU NU RS485 RS232
0
Bit RS485 Bit RS232
0 1
1 0
1 0
D6 D5 D4
NU WDO NU
NU NU NU
3-3
Installing the Board
D3 D2 D1 D0
ST1 NU NU
ST1 NU NU
1 0
Bit ST1
X
0
1
D3 D2 D1 D0
NU NU NU PFO
NU NU NU NU