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The RCM3400 Prototyping Board comes with a 220 ? termination resistor and two 681 ?
bias resistors installed and enabled with jumpers across pins 1–2 and 5–6 on header JP3,
Factory
Default
C19
C21
BT1
5 PA0
PA2
PA4
PA6
3
PA1
PA3
PA5
PA7
CX2
UX2
C7
C5
R10
U4
C18
C22
C25
C28
C30
R46
Battery
L1
D1
D2
6 4
U2
2
7
JP3
2
JP8
JP4
R26
RP4
JP3
681 W
R24
R22
termi-
PB1
PB3
PB5
PB7
PC1
PC3
PC7
/IOWR
SMODE1
PD0
PD5
PD7
PE1
PE4
PE6
PF0
PF4
PF6
PG0
PB2
PB4
PB6
PC0
PC2
PC6
/IORD
STAT
SMD0
PD4
PD6
PE0
PE2
PE5
PE7 6
PF1
PF5
PF7
PG1
CX1
UX1
485+ U3
C59
C56
R21
C39
6
RP2
C53
C51
CX3
CX4
CX5
RP3
1
R67
5
U5
PG6
C23
C53
PG7
C26
CX7 CX9
CX8 CX10
CX6 CX11
+3.3 V
RESET
1
C55 bias 2
C50
JP6
JP7
nation 220 W
R39
R40
R41
R42
R62
S1
+5 V
GND
+3.3 V
C31
C32
R45
C33
C34
C35
C36
C37
U7
R54
C41 C42
U6
C46
R59
C49
C51
C50
Y1
C52
U10
HOT
C55
C59
C54
U12
+5 V
C56
U13 C60
R64
GND GND
LCD1JA
C61
DCIN
GND
+3.3 V
+5 V
485?
bias
PG2
PG4
PG6
/RES OUT
+3.3 V
VBAT
PG3
PG5
PG7
RESET IN
GND
+3.3 V
C28
C13
R3
C19
C14
C1
R1
R16
681 W
GND
GND
C1
R1
IR1
C3
R4
R5
R3
C4
R8
U1
R13
R14
JP1
JP2
GND
+5 V
DS1
DS2
LCD1JB
LCD1JC
GND
R2
J3
PD6
R47
PD7
R57
RCM3400
PROTOTYPING
BOARD
GND AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 THERM GND CNVRT VREF
S2
PD5
2
1
S3
PD4
2
1
+3.3 V
GND
+5 V
+3.3 V
GND
+5 V
Figure B-9. RS-485 Termination and Bias Resistors
For best performance, the termination resistors in a multidrop network should be enabled
only on the end nodes of the network, but not on the intervening nodes. Jumpers on boards
whose termination resistors are not enabled may be stored across pins 1–3 and 4–6 of
header JP3.
User ’s Manual
87
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