101-0401 Rabbit Semiconductor, 101-0401 Datasheet - Page 51

• Manufacturer Part Number: 101-0401
• Description: KIT DEV RABBIT2000/TCP/IP
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore 2000r
• Type: MPU Moduler

Specifications of 101-0401

• Rohs Status: RoHS non-compliant
• Contents: Rabbit 2000™ TCP/IP Development Board, Demo Board, Power Supply, Cable and Software
• Processor To Be Evaluated: Rabbit 2000
• Interface Type: RS-232, RS-485
• For Use With/related Products: RCM2000, RCM2010, RCM2020
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 101-0401; 316-1005; Q906133

5.1.1 RS-232
The TCP/IP Development Board’s RS-232 serial channel is connected to an RS-232 trans-
ceiver, U11. U11 provides the voltage output, slew rate, and input voltage immunity
required to meet the RS-232 serial communication protocol. Basically, the chip translates
the Rabbit 2000’s 0 V to +Vcc signals to RS-232 signal levels. Note that the polarity is
reversed in an RS-232 circuit so that +5 V is output as approximately -10 V and 0 V is out-
put as approximately +10 V. U11 also provides the proper line loading for reliable commu-
nication.
The maximum baud rate is 115,200 bps. RS-232 can be used effectively at this baud rate
for distances up to 15 m.
5.1.2 RS-485
The TCP/IP Development Board has one RS-485 serial channel, which is connected to the
Rabbit 2000 Serial Port B through U10, an RS-485 transceiver. The chip’s slew rate limit-
ers provide for a maximum baud rate of 250,000 bps, which allows for a network of up to
1200 m (or 4000 ft). The half-duplex communication uses the Rabbit 2000’s PC0 pin to
control the data enable on the communication line.
The RS-485 signals are available on pins 3 and 4 of header J7, and on J5, the RJ-12 jack.
The TCP/IP Development Board 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).
Alternatively, the RS-485 multidrop network may be hooked up using cables with RJ-12 plugs.
Note that the RJ-12 jack has +RAW_485 and GND, which means that only one TCP/IP Devel-
opment Board needs to be connected to an external power source via an AC adapter. When
doing so, ensure that the AC adapter has sufficient capacity for the network — each TCP/IP
Development Board nominally draws 100 mA at 24 VDC.
Getting Started
NOTE: The RS-485 port is available only in the factory default configuration. The RS-485
CAUTION: If you plan to connect a power supply to more than one TCP/IP Devel-
opment Board in an RS-485 network using the RJ-12 jacks, rework the RS-485 cables
so they do not connect +RAW_RS485 through the RJ-12 jack to the boards in the
network.
port will not be available when you select the configuration option for both 3-wire
RS-232 ports or one 5-wire RS-232 port.
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