KEYENCE N-400 - Manual (Page 80)

Chapter 4 Multi-Drop Link Mode Control Procedure
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● Specific ID polling ON
Command: POLEmm
[mm = 01 to 31 (ID number)]
Response: OK
ERR01: “mm” exceeds the range of “01” to “31”.
The “Specific ID polling ON” command is used to execute polling for the BL
series with the specified ID number only.
When the N-400 executes polling for several BL series in reading rate check
mode, a large amount of data is continuously sent from the BL series, which
causes the buffer overflow error because the polling interval is longer than the
reading interval.
To perform the reading rate check, use the “Specific ID polling ON” command.
● Checking auto polling
Command: POLE
Response: mm OFF
mm = 01 to 31 (ID number)
Auto polling is performed for the BL series specified by “IDmm” only.
mm = 00: Auto polling ON
OFF: Auto polling OFF
● Auto polling OFF
Command: POFF
Response: OK
Checking connections in multi-drop link mode
Checks if the RS-485 communication between the N-400 and each BL series is
normal.
Command: SRCmm
[mm = 01 to 31 (ID number)]
Response:
OK: Connection is correct.
NC: “Disconnection” error
SERR: Communication error
ERR01: “mm” exceeds the range of “01” to “31”.
Controlling reading operation
Used to activate the reading trigger signal using a command in multi-head scan
mode.
* This command can be used in multi-head scan mode only.
● Starting reading
Command: LON
Response: None
● Ending reading
Command: LOFF
Response: None
You can start/end reading operation by sending the above command in the
same way as when using trigger input.
These commands can be used in multi-head mode only.