3.5 Status
LED
When user turning the I-7531 on, the status LED of I-7531 will be display
with red light. Moreover, when a message passes through I-7531, the status
LED will be twinkle once with yellow light while the red light is still on.
Note 3: Twinkling rate correlates with baud rate of CAN bus. User may see
no twinkling when the twinkling period is too short because of the
higher baud rate of CAN bus. Besides, the yellow LED could look
like always on when bus loading is heavy.
3.6 Terminator Resistor Setting
According to the ISO 11898-2 specifications, the bus line of CAN_H and
CAN_L must be terminated by resistor for proper operation. The equivalent
resistance between CAN_H and CAN_L should be 60
Ω
. There are some
examples below.
Figure6. Terminator Resistor
Case1: R
T
= 120
Ω
Case2: R
T
= 180
Ω
R
T
CAN_H
R
T
CAN_L
Case3: R
T1
= 180
Ω
, R
T2
= 120
Ω
R
T
R
T
CAN_H
R
T
CAN_L
CAN_H
R
T1
CAN_L
R
T1
R
T1
R
T2
R
T2
I-7531 CAN Repeater User Manual (ver. 1.5, 2012/11/22) ------10
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