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2-PORT RS-232/422/485 PCI HOST ADAPTER
Appendix E: Board Layout
Figure E-1. Board layout.
GD75232
U1
GD75232
U2
75175
U4
E5
C1
C3 R4 R5 R8 R9
R3 R5 R7
C4
U5
U6
C6
J1
C7
R27
R28
C8
C9
U7
C10
R29
R30
C12
C11
93CS46
R1
C13
C14
C15
C16 C17
J2C
Y1
R8
U8
P1
PCI9050
XC9536-7201
7201
+
MADE IN USA
DIV1
DIV2
DIV4
DIV1= DIVIDE BY 1
DIV2= DIVIDE BY 2
DIV4= DIVIDE BY 4
• JxC - CLOCK DIV •
C2
J1C
DIV1
DIV2
DIV4
R31
E6
U9
16550 PLCC16550 PLCC
Port 1 Port 2
PORT1= J1x
PORT2= J2x
P= PULL UP/DOWN ENABLE
T= TERMINATION ENABLE
L= CONNECT RX TO TX
• JxA JUMPER SETTINGS •
Port 1
J2
Port 2
R10 R11
R12
R13
R14
R15
R16 R20 R24
R17 R21 R25
R18 R22 R26
R19 R23
75174
U4
HEADER24PINW
E4
Port 2
RS422
HEADER24PINW
E3
RS232
HEADER24PINW
E2
Port 1
RS422
HEADER24PINW
E1
RS232
R2
J1B J2B
C5
J1A
P P T L L
J2A
P P T L L
RS422 - REMOVE ALL JUMPERS
RS485 - AT= AUTO ENABLE
RS485 - RT= RTS ENABLE
RS485 - NE= NO ECHO
• JxB JUMPER SETTINGS •
AT
RT
NE
AT
RT
NE