RayTek MI Miniature Infrared Sensor User Manual
Programming Guide
76
MI
11.7 Multiple Units (RS485 Multidrop Mode)
Up to 32 units can be connected within a RS485 network, see section
5.6
5.6
on page 31. To direct a
command to one unit among the 32 possible, it is necessary to
„address“ a command. Therefore, a 3‐digit number is set prior the
command. The 3‐digit number is determined between 001 and 032.
Exception: Broadcast command.
If a command is transferred, starting with the 3‐digit number 000, all
units (with addresses from 001 to 032) connected will get this
command – without to send an answer.
Note: A unit with the address 000 is a single unit and not in
multidrop mode.
„address“ a command. Therefore, a 3‐digit number is set prior the
command. The 3‐digit number is determined between 001 and 032.
Exception: Broadcast command.
If a command is transferred, starting with the 3‐digit number 000, all
units (with addresses from 001 to 032) connected will get this
command – without to send an answer.
Note: A unit with the address 000 is a single unit and not in
multidrop mode.
XA=024 will set address to 24 (unit must not be in multidrop mode)
Changing an address:
(e.g. the address is change from 24 to 17)
(e.g. the address is change from 24 to 17)
command
answer
„017?E“
„017E0.950“
„017XA=024“
“017XA024” setting of a new address
„024?E“
„024E0.950“
Example for the broadcast command:
command
answer
“024?E”
“024E0.950”
“000E=0.5”
will be executed from all units, no answer
“024?E”
“024E0.500”
“012?E”
“012E0.500”