101-0402 Rabbit Semiconductor, 101-0402 Datasheet - Page 52

• Manufacturer Part Number: 101-0402
• Description: KIT DEV TCP/IP 2000 INTL
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 2000r
• Type: MPU Moduler

Specifications of 101-0402

• Contents: RabbitCore Module, Dev. Board, Cable and Dynamic C® CD-Rom
• For Use With/related Products: RCM2000, RCM2010, RCM2020
• Lead Free Status / RoHS Status: Vendor undefined / Vendor undefined

The TCP/IP Development Board comes with a 220
bias resistors installed and enabled with jumpers across pins 1–2 and 5–6 on header JP6, as
shown in Figure 8.
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
TCP/IP Development Boards in the network by removing both jumpers from header JP6.
Note that older versions of the TCP/IP Development Board do not have this jumper fea-
ture, and the surface-mounted bias and termination resistors shown in Figure 8 have to be
removed in networks containing more than 10 TCP/IP Development Boards.
5.1.3 Programming Port
The TCP/IP Development Board has a 10-pin programming header labeled J4. The pro-
gramming 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 connected device can force the TCP/IP Development Board to start up in an
external bootstrap mode.
The programming port is used to start the TCP/IP Development Board in a mode where
the TCP/IP Development Board will download a program from the port and then execute
the program. The programming port transmits information to and from a PC while a pro-
gram is being debugged.
The TCP/IP Development Board can be reset from the programming port.
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.
48
NOTE: Refer to the Rabbit 2000 Microprocessor User’s Manual for more information
related to the bootstrap mode.
W
W
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Figure 8. RS-485 Termination and Bias Resistors
termination resistor and two 680
TCP/IP Development Kit