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RS-422/485 SERIAL INTERFACE PLUS, 4-PORT
Appendix B: Board Layout
C13
74LS244
U10
C17
74LS245
U16
RP4
RP3
C16
75174
U15
C15
75175
U14
C14
75174
U13
75175
U12
74HC04
U11
R17
J4E
P
P
T
L
L
R16
J3E
P
P
T
L
L
R15
J2E
P
P
T
L
L
R14
J1E
P
P
T
L
L
P3
SD837M-318
* JxE JUMPER SETTINGS *
P= PULL UP/DOWN ENABLE
T= TERMINATION ENABLE
L= CONNECT RX TO TX
* JxD JUMPER SETTINGS *
RS422= REMOVE ALL JUMPERS
RS485-AT= AUTO ENABLE
RS485-RT= RTS ENABLE
RS485-NE= NO ECHO
J4D
R12
R13
AT
RT
NE
J3D
R10
R11
AT
RT
NE
J2D
R8
R9
AT
RT
NE
J1D
R6
R7
AT
RT
NE
C11
P1P2
C5
U3
16550 PORT3
C8
U6
16550 PORT4
C10
U8
XC7336-3440
C9
U7
MACH215
C4
U2
16550 PORT1
C7
U4
16550 PORT2
74HC125
U5
SWITCH8DIP
C12
U9
MACH215
RP1
RP2
A9
A8
A7
A6
A5
S3
S2
S1
SW1
* JxC= CLOCK DIV SELECT *
DIV1= CLOCK DIVIDE BY 1
DIV2= CLOCK DIVIDE BY 2
DIV4= CLOCK DIVIDE BY 4
* JxA= INT MODE SELECT *
N= NORMAL INT MODE
S= SHARED INT MODE
M= SHARED WITH RESISTOR
C5
+
C3
74LS74
U1
C2
C1
R1
Y1
3 4 5 6 7 910 11 12 15
J4C
DIV1
DIV2
DIV4
J4B
J4A
N S M
D4
R5
3 4 5 6 7 910 11 12 15
J3C
DIV1
DIV2
DIV4
J3B
J3A
N S M
D3
R4
3 4 5 6 7 910 11 12 15
J2C
DIV1
DIV2
DIV4
J2B
J2A
N S M
D2
R3
3 4 5 6 7 910 11 12 15
J1C
DIV1
DIV2
DIV4
J1B
J1A
N S M
D1
R2
* JxB= INT SELECT *
PORT1= J1x
PORT2= J2x
PORT3= J3x
PORT4= J4x
Figure B-1. Board Layout.