151-0153 Rabbit Semiconductor, 151-0153 Datasheet - Page 64

• Manufacturer Part Number: 151-0153
• Description: ASSEMBLY - RABBITFLEX CABLES
• Manufacturer: Rabbit Semiconductor
• Series: RabbitFLEX™r

Specifications of 151-0153

• Accessory Type: Cable Assembly
• For Use With/related Products: BL300F
• Lead Free Status / RoHS Status: Vendor undefined / Vendor undefined

5.2 Serial Communication
Dynamic C provides drivers for RS-232 and RS-485. For a full discussion of these drivers, see the Techni-
cal Note, TN213: “Rabbit Serial Port Software.”
5.2.1 Comparison of RS-232 and RS-485
Both RS-232 and RS-485 are popular and well-established serial communication protocols that are used
by many different devices. There are a number of considerations when choosing which serial protocols are
right for a particular application. The following table looks at both protocols and compares these consider-
ations.
RS-485 was developed to overcome some of the limitations of RS-232, such as the distance between trans-
mitter and receiver. RS-485 also has a more open topology, allowing the RabbitFLEX BL300F to be part
of a multidrop network of serially connected devices.
5.3.1 Termination Resistors
You can design the RS-485 circuit to include termination resistors or not. A third option is to have select-
able termination. For best performance in a multidrop network, termination resistors are enabled only on
the end nodes and are disabled on intervening nodes.
At the time of this writing, more information on the termination of transmission lines can be found at:
58
www.bb-elec.com/tech_articles/rs422_485_app_note
Max number of drivers
Mode of operation
Topology
Max distance
Max slew rate
Parameter
Table 5-3. Serial Communication Parameters
Figure 5.1 Multidrop Network Wiring
1
Full-duplex
End-to-end
15 m
30 V/µs
www.rabbit.com
RS-232
32
Half-duplex
Multidrop, with node-to-node
communication
1200 m
n/a
More Information on RabbitFLEX BL300F
RS-485