User’s Manual
83
The RCM3600 Prototyping Board comes with a 220
Ω
termination resistor and two 681
Ω
bias resistors installed and enabled with jumpers across pins 1–2 and 5–6 on header JP1,
as shown in Figure B-9.
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 JP1.
B.4.4 Other Prototyping Board Modules
An optional LCD/keypad module is available that can be mounted on the Prototyping
Board. The signals on headers LCD1JB and LCD1JC will be available only if the
LCD/keypad module is installed. Refer to Appendix C, “LCD/Keypad Module,” for
complete information.
CAUTION:
Pin PB7 is connected as both switch S2 and as an external I/O bus on the
Prototyping Board. Do not use S2 when the LCD/keypad module is installed.
+V
/RESET
LDE0
LED2
LED4
LED6
GND
+BKL
T
/CS
LED1
LED3
LED5
GND
GND
A2
A1
D1
D3
D5
D7
GND
A3
A1
D0
D2
D4
D6
GND
+BKL
T
/CS
LED1
LED3
LED5
GND
GND
A2
A0
D1
D3
D5
D7
L2
C1
C2
IR1
R1
R2
R3
R4
Rx
Tx
R5
R6
C3
R9
R7
R8
JP1
J1
+485
GND
485
JP2
R12
R11
U3
C4
C7
C8 C10
R13
C11
U4
C5
C6
C9
J2
GND
/IORD
PB5
PB3
PA0
PA6
PB0
/RES
+5V
PF4
PF6
PC1/PG2
PC0_TXD
PE5
PE1
PG7_RXE
PD4
VBAT
PA4 P
A
2
/IOWR
PE7
PB4
PB2
PA1
PA3
PA5
PA7
PB7
PF0
PF1
PF5
PF7
PE4
PE0
PD5
PG6
TXE
PC2
TXC
PC3/
PG3
GND
RXC TXC RXE
GND
NC
U1
C12
C13
C15
C14
L1
C17
U2
C18
U6
R14
D1
C19
D2
J4
DCIN
+3.3V
GND
+5V
+5V
GND
+3.3V
LCD1JB
LCD1JC
LCD1JA
U5
C16
R15
BT1
GND
TXD
RXD
TXE
GND
TCM_SMT_SOCKET
+5V
VBA
T
PD5
/IORD
PG6_TXE
PE0
PE4
PE7
PC2_TXC
PC0_TXD
PF6
PF4
PB5
PB3
PB0
PF1
PA
1
PA
3
PA
5
PA
7
J5
GND
R16
GND
/RES
PD4
/IOWR
PE1
PE5
PC3/PG3
PF7
PF5
PB7
PB4
PB2
PF0
PA
0
PA
2
PA
4
PA
6
PG7 RXE
PC1/ PG2
C22
C26
R21 R18
C20
R19
C21
R20
R22
JP4
1
2
RP1
CX1
CX2
CX3
CX4
CX5
CX6
CX7
CX8
CX9
CX10
CX11
UX2
UX1
U8
R23
C24
C25
C23
U7
C27
R25
R24
C28
R26
R27
R28
R29
JP8
R30 R31 R32 R33 R34 R35 R36
C35
R43
C29
J7
THERMISTOR
R37
J8
VREF
AGND
R44
THERM_IN
AIN 06
05
04
03
02
01
00 AIN
AGND
R38
C30 C31
C32 C33
C34
R39 R40
R41 R42
R48
DS1
DS2
R45
R49
R46
DS3
R47
S3
S2
S1
CONVERT
JP5
JP6
JP7
NC
NC
NC
NC
NC
NC
+V
/RST
ET
LED0
LED2
LED4
LED6
GND
A3
A1
D0
D2
D4
D6
RCM36/37XX SERIES PROT
OTYPING BOARD
RESET
R23
C31
C32
C34
C4
C33
C7
C2
JP3
JP2
JP1
R1
C1
C12
C13
C21
C14
C18
C15
U1
U4
R13
U5
C25
C17
C16
C5
C19
RP1
C20
RP3
C10R1
1
Y1
C24
R4
R5
C22
C23
R6
RP5
R8
R16
R15
R2
R9
U2
U3
J2
C26
Q1
R14
R18
U6
R22
R7
C1
1
C8
C9
R3
JP1
4
3
2
1
6
5
Factory
Default
R7
681
W
R9
220
W
R8
681
W
485+
485
6
7
termi-
nation
bias
bias
U3
JP1
6
5
2
1
+3.3 V
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