Baldor NextMove BX, Руководство по установке

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NextMove BX Installation Manual for Mint™ v4
28
MN1258V4 08/2000
Hardware disable of the transmitter after the last byte is sent allows high speed half duplex
transmission.
Figure 3-15: Multi-drop system
The rxd and txd lines should be terminated with 120 Ω Ω Ω Ω resistors at the receiving end as shown.
3.8.4 CAN Bus
CAN (Controller Area Network) is a 1Mb/s local area network. NextMove BX has two CAN
communications channels for connection to other Baldor CAN nodes or for connection to other
networks such as
CAN open
. CAN offers 125kbit/s serial communications over a two wire twisted
pair cable up to a maximum of 500m (approx. 1640ft) in length. CAN offers very high reliability of
communications in an industrial environment, the probability of an undetected error is 4.7x10
-11
.
A range of CAN based I/O expansion modules is available for NextMove BX. See section 5.2 for
further details.
Several CAN peripheral devices may be attached to the same controller via the CAN link using the
Baldor CAN protocol. 63 CAN peripheral devices of any assortment are allowed on the NextMove
BX CAN network. However only 4 enabled keypads are allowed at any one time.
The CAN is brought out to two RJ45 connectors located on the top panel of unit.