NextMove BX Installation Manual for Mint™ v4
30
MN1258V4 08/2000
A very low error rate of CAN communication can only be achieved with a suitable wiring scheme.
The following points should be observed:
1.
CAN must be connected via twisted pair cabling. The connection arrangement is normally
a simple multi-point drop. The CAN cables should have a characteristic impedance of
120
Ω
; and a delay of 5ns/m. Other characteristics depend upon the length of the cabling:
Cable length
Max bit rate
Non Isolated
Max bit rate
Isolated
Specific
resistance
Conductor area
0-40m (0-157ft) 1 Mbit/s
500 kbit/s
70m
Ω
0.25-0.34mm
2
40m-300m
(157ft-1180ft)
200 kbit/s
100 kbit/s
<
60m
Ω
0.34-0.60 mm
2
300m-600m
(1180-2362ft)
100 kbit/s
50 kbit/s
<
40m
Ω
0.50-0.60 mm
2
600m-1000m
(2362ft-3937)
50 kbit/s
25 kbit/s
<
26m
Ω
0.75-0.80 mm
2
2.
Terminators should be fitted at both ends of the network only.
3.
To reduce RF emissions and more importantly, to provide immunity to conducted
interference, shielded twisted pair cabling should be used. If two CAN channels are
bundled in a cable then each requires a twisted pair.
Cable screens/shields should not be connected to 0V on connector sk4 and sk5 as this will cause
ground loop interference into the 0V plane on the processor board.
4.
The 0V rails of all of the nodes on the network must be tied together through the CAN
cabling. This ensures that the CAN signal levels transmitted by a NextMove BX
or CAN
peripheral devices are within the common mode range of the receiver circuitry of other
nodes on the network.
CAN cables are available. See the section 5.2 for details on CAN accessories.
See the Mint v4 CAN Programmers Guide for details on using CAN.
3.9 Reset
State
The NextMove BX will go into
reset
if the power supply drops below approximately 4.75V in order
to prevent any uncontrolled operation of any of the integrated circuits during power down.
When NextMove BX is in
reset
for any reason, most of the controlled interfaces fall into known
states. This is explained further below.
Summary of Contents for NextMove BX
Page 1: ...MN1258V4 08 2000 NextMove BX Installation Manual for Mint v4 Issue 4 0...
Page 2: ...NextMove BX Installation Manual for Mint v4 ii MN1258V4 08 2000...
Page 4: ...NextMove BX Installation Manual for Mint v4 iv MN1258V4 08 2000...
Page 8: ...NextMove BX Installation Manual for Mint v4 viii MN1258V4 08 2000...
Page 12: ...NextMove BX Installation Manual for Mint v4 xii MN1258V4 08 2000...
Page 18: ...NextMove BX Installation Manual for Mint v4 6 MN1258V4 08 2000...
Page 22: ...NextMove BX Installation Manual for Mint v4 10 MN1258V4 08 2000 Figure 3 3 Board Settings...
Page 46: ...NextMove BX Installation Manual for Mint v4 34 MN1258V4 08 2000...
Page 78: ...NextMove BX Installation Manual 66 MN1258V4 08 2000...
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