101-0577 Rabbit Semiconductor, 101-0577 Datasheet - Page 36

• Manufacturer Part Number: 101-0577
• Description: KIT DEV FOR BL2500 COYOTE
• Manufacturer: Rabbit Semiconductor
• Series: Coyoter
• Type: Single Board Computers (SBC)r

Specifications of 101-0577

• Contents: SBC, Dev. Board, AC Adapter, Cable and Dynamic C® CD-ROM
• Product: Modules
• Data Bus Width: 10 bit
• Processor Type: Rabbit 3000
• Sram: 128 KB
• Flash: 256 KB
• Number Of I/os: 24
• Backup Battery: 3 V Lithium Coin Type
• Operating Voltage: 8 V to 40 V
• Power Consumption: 1 W
• Board Size: 100 mm x 100 mm x 29 mm
• Description/function: Computer Module
• Interface Type: Ethernet
• For Use With/related Products: BL2510
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The Coyote comes with a 220  termination resistor and two 681  bias resistors installed
and enabled.
The load these bias and termination resistors present to the RS-485 transceiver limits the
number of Coyotes in a multidrop network to one master and nine slaves, unless the bias
and termination resistors are removed. When using more than 10 Coyotes in a multidrop
network, or when you need the full common-mode immunity per the RS-485 specification,
leave the 681  bias resistors in place on the master Coyote, and leave the 220  termina-
tion resistors in place on the Coyote at each end of the network.
30
W
W
W
Figure 16. RS-485 Termination and Bias Resistors
Coyote (BL2500)