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

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
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
3: I
NSTALLATION AND
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
W
IRING
3-47