Wiring The Can J1939 Bus - IDEC MICROSmart FC6A Series User Manual

3: I
NSTALLATION AND

Wiring the CAN J1939 Bus

This section describes the CAN port terminal arrangement, internal equivalent circuit, and specifications.
CAN Port Terminal Arrangement
CAN Port
No.
1
1
2
2
3
3
4
4
5
5
*1 Internally connected to the SG via a resistor and capacitor connected in a series. (R = 1 Ω, 0.68 μF)
Internal Equivalent Circuit
VCC1
SG1
CAN J1939 Wiring
The specifications and wiring examples differ according to CAN protocol standard J1939-11 and J1939-15. Connect terminating
resistance (120 Ω, 0.5 W or higher) between CAN_H and CAN_L at both ends of the main line when wiring the CAN port.
CAN Protocol Standard
Communication Speed
Nodes
Wire Configuration
Cable
Applicable Standards
Characteristic Impedance
Cable Length
3-52
W
IRING
Signal Wire
SG CAN external power supply (-)
CAN_L CAN_L bus line (dominant low)
CAN_SHLD CAN cable shield
CAN_H CAN_H bus line (dominant high)
(V+) CAN external power supply (+). (N.C. Not connected internally.)
VCC2
VCC2
TXD
CAN
Transceiver
RXD
IC
SG2
SG2
40 m maximum, stub 1 m maximum
FC6A S MICROS
ERIES
Details
*1
Internally connected to
power supply terminal PE (FE)
SG2 SG2 SG2
J1939-11
250 kbps
30
Twisted pair
Shielded
2
0.3 mm to 0.82 mm
ISO 11898/1993
120 Ω
U ' M FC9Y-B1722
MART SER S ANUAL
SG
SG2
CAN_L
CAN_SHLD
CAN_H
(V+)
1 Ω
0.68 μF
Terminal Block
(Port 2)
J1939-15
10
Unshielded
2
(AWG 22 to 18)
40 m maximum, stub 3 m maximum