Industrial
Electronic Devices
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User Manual
M-Bus / RS232 / RS485
Document code: MN67021_ENG Revision 2.100 Page 9 of 25
LEDS:
The HD67021-B2-xxx / HD67022-B2-xxx device has got five LEDs that are used to give information of the functioning status.
The various meanings of the LEDs are described in the table below.
LED
Normal Mode
Boot Mode
1: Device State (green)
Blinks slowly (~1Hz)
Blinks quickly:
Boot state
Blinks very slowly (~0.5Hz):
update in progress
2: Serial communication
(yellow)
Blinks when a M-Bus request on serial is received
Blinks quickly:
Boot state
Blinks very slowly (~0.5Hz):
update in progress
3: M-Bus communication
(yellow)
Blinks when a M-Bus response on M-Bus is received
Blinks quickly:
Boot state
Blinks very slowly (~0.5Hz):
update in progress
4: M-Bus error (yellow)
ON
: error on M-Bus response
OFF
: error not present
Blinks quickly:
Boot state
Blinks very slowly (~0.5Hz):
update in progress
5: Ethernet Link (green)
ON:
Ethernet cable connected
OFF:
Ethernet cable disconnected
ON:
Ethernet cable connected
OFF:
Ethernet cable disconnected
