2. Specification
— 2-8 —
2.2.7. LED Status Monitor (SD, RD, RUN and ERR)
The monitor indicates the status of conection and communicatoin with the network.
When the communication status is nomal, the indicators RUN, RD and SD are on, and that of
ERR is off (In some baud rate, the RD and SD indicators seem like blinking).
Table 2-10: LED status monitor
Indicator Color Description
SD
On: In the middle of tarnsmitting data
RD
On: In the middle of receiving data
RUN
Green
On: Executing the data link. The unit is normal
Off: Not linked to the network. Caririer detection NG, Time-Over, Resetting
Driver Unit’s upper side
SD
RD
RUN
ERR
ERR Red
On：CRC error, SW1and 2 (Station number) setting error, or SW3 (Baud rate)
setting error
Off: Communicating normally or Resetting hardware
Blinking: The switch setting (SW1, 2 and 3 ) is altered
Table 2-11: Monitoring pattern
SD RD RUN ERR Status
✷ ● ● ○
Communicating normally
✷ ● ● ✷
Communicating normaly, with occasional CRC error
✷ ● ● ✷*
Baud rate and/or station number setting are alterd at the time of power
on.
*
LED flickers at intervals of every 0.4 [s]
○ ● ● ✷
Transferred data become “CRC Error” and thus unable to responsd
○ ● ● ○
No data transmission to the Driver Unit
✷ ● ○ ✷
Though the polling is responding, the refresh receiving has a CRC error
○ ● ○ ✷
Cannnot respond as the data to the Driver Unit has a CRC error
✷ ● ○ ○
The communication link is not active
○ ● ○ ○
No data sent to the Driver Unit, or impossible to receive the data
○ ○ ○ ○
Impossible to receive the data. Power shutdown, or the hardware is in
the middle of resetting
○ ●／○ ○ ●
Setting error on the baud rate or station number
●: On ✷: Blinking ○: Off
The SD monitor is blinking quickly, and thus it occasionally seemes like as if it is on depending
on the communication state.
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