I-7530A RS-232/485/422 to CAN Converter User’s Manual (Version 1.2, Sep/2011) ------------- 11
2.6 LED Indication
The I-7530A provides the Converter function between the RS-
232/485/422 port and the CAN port. It can handle both an 11-bit and 29-
bit ID format according to whether it is a CAN 2.0A or 2.0B. In order to
provide high performance when converting data,
the I-7530A has built in
software FIFO queues, which include 1000 CAN data frames. It also
provides two LEDs to indicate to users what situation the I-7530A is in.
The ON LED indicator establishes the power and operation situation
simultaneously. If the module is working in the operation mode, the ON
LED is always turned on. However, when the module is working in the
configuration mode, the ON LED will flash approximately once per second.
The ERR LED is used for demonstrating an error that has occurred. That
is, the ERR LED is normally turned off when the module works in a good
condition. On the other hand, when the BUS OFF error indicator of the
CAN controller has been alerted, the ERR LED will turn on. In this case,
users can only reboot the I-7530A module in order to turn off the ERR
LED. If the CAN or RS232/485/422 FIFO overflows, the ERR LED will also
be turned on. Furthermore, If users want to check what the error situation
is they must send the command string “S[CHK]<CR>”. Depending on the
result, users will need to either reboot the I-7530A or use the command
string “C[CHK]<CR>” to clear the FIFO flag, which will then turn off the
ERR LED.
Figure 8: LED position
Table 3: LED indication
LED Name
I-7530A Condition
LED Status
Configuration Mode
Flash once per second
Turn on when no data needs
to be send to CAN bus
ON LED
Operation Mode
Flash once when sending a
CAN message
ERR LED Some errors occurred
Always turned on
