Rabbit OP7100 User Manual Page 41

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User’s Manual 35
The OP7200 comes with a 220 termination resistor and two 681 bias resistors
installed and enabled with jumpers across pins 1–2 and 4–6 on header J8, as shown in
Figure 16.
Figure 16. 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 5–6 of
header J8.
NOTE: Remove the back cover from the OP7200 to access the bias and termination
resistor jumpers on header J8.
J8
4
3
2
1
6
5
Factory
Default
D23
D20
+PWR PWR +K OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 GND
IN12 IN13 IN14 IN15 /RST TXC RXC TXD RXD 485 +485 GND
J10
Q31
JP9
J15
R44
R41
R42
R40
R31
R29
R43
R46
R45
C33
JP4
R19
R26
R27
R30
R28
R25
R20
C2
R17
R16
IN16 IN17 IN18 AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AGND
R18
C4
R15
R1
R2
C1
JP1
D13
D12
D14 D15
C5
Y1
C60
C61
Q5
U2
1
60
C57
D11
R79
R78
R77
R76
R75
R74
C36
JP2
JP7
IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 IN11
C43
C44
R82
R83
R84
J9
R85
R86
R165
R164
R162
R89
R87
R88
C51
C50
R90
C48
JP3
J12
R71
R72
R59
R60
R66
C40
C66
JP6
JP5
R108
C65
JP8
R61
R159
R147
Q12
J7
Q13
C39
C49
C13
L9
D24
LS1
JP10
1
3
2
4
MSTR
SLAVE
D1
D3
D2
D5
D4
Q2
R24
Q4
R23
Q3
R22
Q8
R38
Q7
R37
Q6
R39
Q11
R55
Q10
R56
D6 D8
D9
R64
R62
R65
C86
C29
C30
C16
C17
C18
C6
C8
C7
R91
R14
DS1
DS2
TVS1
C82
J8
R152
R151
C85
C84
R149
J13
J16
J2
J6
J3
R36
R169
R80
R81
D10
C32
C31
L2
J14
Battery
J1
R2
C3
D2
R7
C27
R8
R36
RT1
R41
R37
R38
D1
R39
Y2
C2
C1
U8
U7
U3
U6
C7
GND
GND
EGND
DS2
LNK
ACT
DS1
R19
Q3
Q4
Q5
Q2
R1
Y1
C4
C17
C8
R9
R13
R11
U1
BT1
R15
C12
R17
R20
C13
Y3
R16
R22
R21
C14
R18
C25
C28
D3
J2
JP4
JP3
JP1
JP6
C30
JP2
JP5
C29
U2
Flash
EPROM
R70
681 W
R68
220 W
R69
681 W
485+
485
6
7
termi-
nation
bias
bias
U6
J8
1
2
4
6
Vcc
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