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User’s Manual
23
The BL2000 comes with a 220
Ω
termination resistor and two 681
Ω
bias resistors installed
and enabled with jumpers across pins 1–2 and 3–4 on header JP1, as shown in Figure 13.
Figure 13. RS-485 Termination and Bias Resistors
The bias and termination resistors in a multidrop network should only be enabled on both
end nodes of the network. Disable the termination and bias resistors on the intervening
BL2000 units in the network by removing both jumpers from header JP1.
3.4.3 Programming Port
The BL2000 has a 10-pin programming header labeled J5. The programming port uses the
Rabbit 2000’s Serial Port A for communication. The Rabbit 2000 startup-mode pins
(SMODE0, SMODE1) are presented to the programming port so that an externally con-
nected device can force the BL2000 to start up in an external bootstrap mode.
NOTE:
Refer to the
Rabbit 2000 Microprocessor User’s Manual
for more information
related to the bootstrap mode.
The programming port is used to start the BL2000 in a mode where the BL2000 will
download a program from the port and then execute the program. The programming port
transmits information to and from a PC while a program is being debugged.
The BL2000 can be reset from the programming port via the
/EXT_RSTIN
line.
The Rabbit 2000 status pin is also presented to the programming port. The status pin is an
output that can be used to send a general digital signal.
R68
681
W
R70
220
W
R77
681
W
485+
485
6
7
termi-
nation
bias
bias
U8
Factory
Default
U1
C2C3
J4
J3
C8
U2
R5
R1
1
R10
C75
C1
1
C4
U3
R8
R18
R2
R3
R7
C78
C79
C5
+
C9
R14
C12
C7
J12
RXD1 TXD1
AGND DAC1 DAC0 ADC8 ADC7 ADC6 ADC5 ADC4 ADC3ADC2 ADC1 ADC0
GND
AGND
AGND
AGND
AGND
AGND
AG ND
C85
JP1 R157
JP1
1
2
3
4
JP1
1
2
3
4
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