RS-422/485 Multiport Serial PCI Card
3
3.
Board Layouts and Connectors
3.1 2S with DB9 Male Connectors
3.1.1 JP5: UART Input Clock Speed Selector
HI
LOW
J2: S1
JP7: S1
Terminator
Enable/Disable
J3: S2
JP8: S2
Terminator
Enable/Disable
JP1: RS-422/485
Mode Selector
JP5: UART Clock Speed
Selector
UART Input Clock Speed = 1.8432MHZ,
the maximum baud rate is 115.2Kbps
(Default)
HI
LO
W
UART Input Clock Speed = 14.7456MHZ,
the maximum baud rate is 926.1Kbps. In
this setting,
you need go to Windows’
COM port Properties to detect this input
clock automatically and fit this clock
value (see the software setup for more
details)
RS-422/485 Multiport Serial PCI Card
16
7.2 Windows
98/ME
Set the JP5 to “HI”
In the Windows COM port properties as the following figure,
select
〝
Data rate
〞
and click on
〝
Automatic Crystal
Detection
〞
The
〝
Crystal Frequency
〞
settings will be set to
〝
14.7456MHZ
〝
, then click
〝
OK
〞
The settings will be saved by Windows. You don’t need to
configure it again whenever you restart the system
