Reference – KEYENCE N-410 User Manual
Page 81
4-7
4-2
Multi-drop Link Mode Data Communication
Con
4
1. A "polling request" is sent from the host computer.
2. The BL/SR/RF Series device responds with its read data.
• mm = 01 to 31: The BL/SR/RF Series device ID number
• nnnn = the number of characters in the data (4 ASCII characters)
* the total of character count for the data is part 1 + part 2.
• (Data) = Data read
ERROR
: A read error has occurred.
e
: Nothing has been read
OVER
: A buffer overflow has occurred.
"Send Buffer Capacity" (Page 4-9)
NC
: No BL/SR/RF Series device bears the specified ID number or the
communication has not been established with that device.
ERR**
: Error code (**: Error code)
• The polling command formats are both possible.
At the end of the command,
may be added. At the head of the command,
may
be added to clear the N-410 receive buffer.
• Read data must be set to be formatted in one of the following ways ("header" and "delimiter"
settings).
"Selecting a protocol" (Page A-16)
Read data can be formatted in the following manners or in any other manner desired.
Header :
,
, None
Delimiter :
,
,
(About settings)
Manual polling can be used if no ID number has been registered with the AutoID Navigator (once
ID numbers have been recorded, be sure to activate auto-polling mode).
"Auto-polling" does not send "manual polling" commands from the host computer, but rather
has the N-410 send the data received from BL/SR/RF Series devices to the host computer
as needed, thus reducing the load on the host computer.
%
P mm
Header
Delimiter
%
P mm -
Header
Delimiter
(Data)
ID addition
(1) (2)
nnnn
,
%
P mm CR
%
P mm
STX
ETX
LF
ESC
ESC
STX
CR
CR
LF
ETX
Reference