Cable Selection - ICP DAS USA GW-7228 User Manual

Table 2-3: LED indication of the GW-7228
LED Name
Firmware Updating Mode
Hardware WDT Fail
ALL LEDs
Contact to ICP DAS
No Error
CAN Bus Transmission Fail Blink per 100 ms
CAN Bus-Off
PWR LED
Can't Claim Address in
J1939 Network
Power Failure
Transmission
J1939 LED
Bus Idle
MODBUS Transmission
LED Bus Idle
2.8

Cable Selection

The CAN bus is a balanced (differential) 2-wire interface running over
either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or
Ribbon cable. The CAN-L and CAN-H Wire start on one end of the total
CAN network that a terminator of 120 Ohm is connected between CAN-L
and CAN-H. The cable is connected from CAN node to CAN node,
normally without or with short T connections. On the other end of the cable
Ω
again a 120 (Ohm) terminator resistor is connected between the CAN
lines. How to decide a cable type, cable length, and terminator depends
on the baud rate in the CAN bus network, please refer to the following
table 2-4.
Figure 2-18: Un-shielded Twisted Pair (UTP)
GW-7228 J1939/Modbus RTU Slave Gateway User's Manual (Ver 1.3, Apr/2011) ------------- 18
GW-7228 Status LED Status
All LED always turned on
All LED blink per 1 second
All LED blink per 100 ms
Always turned on
Blink per 500 ms
Blink per 1000 ms
Off
Blink
Off
Blink
Off