Programming Port - Z-World Wildcat BL2000 User Manual

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.
485+
U8
6
7
485–
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
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.
User's Manual
R68
JP1
bias
681 W
2
1
R70
termi-
220 W
nation
4 3
R77
bias
681 W
3
4
J4
RXD1 TXD1 AGND DAC1 DAC0 ADC8 ADC7 ADC6 ADC5 ADC4 ADC3 ADC2 ADC1 ADC0
J3
GND AGND AGND AGND AG ND
C2C3
U2 C75 R5
C79 R2 C78
C8
R7
C4
U1
/EXT_RSTIN
1 Factory
Default
JP1
2
AGND AGND
R3 J12
C5
C7
R8 C9
U3
R14
R18
C12
line.
23