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The BL2600 can be used in an RS-485 multidrop network. Connect the 485+ to 485+ and
485– to 485– using single twisted-pair wires (nonstranded, tinned) as shown in Figure 13.
Note that a common ground is recommended.
The BL2600 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 JP7, as shown in Figure 14.
485+
U17
6
J4 RABBITNET 1
7
485–
J6 RABBITNET 0
J8
C10
R10
R15
C13
R16
R17
R21
R20
U13
JP6
R43
2
1
AIN1 AIN3 AIN5 AIN7 AGND AV1 AV3 AI1 AI3 AGND
AIN0
AIN0 AIN2 AIN4 AIN6 AGND AV0 AV2 AI0 AI2 AGND
AIN1
AIN2
AIN3
JP6
4–20 mA
AV0 AV1 AV2 AV3 AI0 AI1 AI2
Figure 14. RS-485 Termination and Bias Resistors
User's Manual
Figure 13. BL2600 Multidrop Network
R97
JP7
bias
681 W
1
2
R98
termi-
220 W
nation
5
Q1
Q2
6
Q3
Q4
Q5
Q6
Q7
J5
R96
Q10
Q9
Q14
Q12
Q13
C2
bias
C3
681 W
U6
U5
RP12
U7
J9
J7
R111
U11
C14
C78
C17
U12
R18
C20
L1
R19
R25
R27
R29
R26 R28
R30
R32
C23
U14
U15
J11
20
19
C25
J12
C22
J15
DCIN DCIN GND
GND
AI3
AGND
R84
RP2
C1
U1
R1
R8
R7
R9
R10
Q8
R14
R17
R18
Q15
Q16
R19
R20
J3
R22
R23
U4
RP14
RP15
U8
C31
D1
RCM3000 ETHERNET CORE MODULE
C8
U6
RP16
Q1
U9
R41
C47
C9
C53
C57
C59
L1
2
Factory
U8
C62
Default
JP7
R58
1
3
BT1
R69
R73
C27
C28
Q17
D2 Q18
Q19
D1
D3
J14
J13
2
26
1
25
+HK0
GND
HOUT1
+HK2
GND
HOUT3
GND
HOUT0
+HK1
GND
HOUT2
+HK3
GND
+HK0
GND
HOUT1
+HK2
GND
HOUT3
GND
HOUT0
+HK1
GND
HOUT2
+HK3
GND
RP5
C3
U1
C5
U2
RP6
RP1
R6
R25
RP17 RP18
U5
U4
RCM1
R29
R37
R35
C42
R39
JA
Y3
R40
GND/EGND
R7
4
6
R8
L2
U16
C64
C67
C68
C71
R63 R64
U17
J4
C79
DS1
5
Y4
DS2
R71
DS3
C32
R75
GND
C33
C86
U18
R58
R59
R60
485 TERM.
C35 C36 C37
RESISTOR
C34
D4 Q20
RXE
485+
RXC
RXF
JP7
2
1
TXC
TXF
TXE
485–
J17
GND
RXC
RXF
RXE
485+
TXC
TXF
TXE
485–
GND
21
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