Baumer N 140 - Manual (Page 14)

N 140
www.baumer.com 14
4.4. Identifier commands
Command
code
Data amount
in bytes
read write Broad-
cast
Save in
EEPROM
Significance
A (41h) 2 X X X X Assign or indicate device identifier
B (42h) 2 - - - - SPA confirmation in addressing mode
4.4.1. Assigning device identifiers in the network, command „A“ (41h)
This command is creating an automated process where the device identifier is assigned in successive order to
every single SPA upon commissioning of the system. The first identifier to be assigned is broadcasted to all
networked SPAs as follows:
SOH Adr Cmd identifier=01 EOT CRC
Transmission
01h 83h 41h 30h 31h 04h B4h
All SPAs now show the identifier just transmitted and that is to be assigned in the upper line of the display. The
bottom line indicates the device-specific identifier. To enter the new identifier, the shaft of the respective SPA
has to be turned by half at least (direction does not matter). The identifier is now entered and appears in the
bottom line of the display (as device-specific identifier). Both identifiers are now identical. As soon as the shaft is
in idle position again and after having elapsed 3 seconds, the SPA will transmit to master the following
confirmatory command „B“ (42h):
SOH Adr Cmd identifier=01 EOT CRC Transmission
To Master 01h 21h 42h 30h 31h 04h 86h
The Master may now transmits command „A“ with the next identifier to be assigned as previously described.
This way, the respective (successive) identifiers are automatically assigned to all networked SPAs, one after the
other.
Important: The confirmatory command „B“ transmitted by N 140 to master will be repeated after 3 seconds
provided the master has not previously transmitted another „A“ command.
4.4.2. Show identifier in the display, command „A“ (41h)
This command less parameters as a broadcast command (address/Identifier=99) will make every networked N
140 indicate the device-specific identifier in the bottom line of the display. The upper line is blind.
This command is a designated broadcast command.
SOH Adr Cmd EOT CRC
Transmission
01h 83h 41h 04h 80h
Response Not confirmed
The SPA remains in this mode until being switched off and on again or until transmission of another command.
4.4.3. Extended identifier command „AX“ (41h,58h )
This extended command is utilized for addressing individual multicon devices in the bus network in a similar
way as described above. By broadcast command the identifier to be assigned is transmitted to all networked
devices as follows:
SOH Adr Cmd Sub Identifier = 01 EOT CRC
Transmission
01h 83h 41h 58h 30h 31h 04h 40h
Response Not confirmed
Similar to the standard command all devices now show the identifier just transmitted and that is to be assigned
in the upper line. To enter the identifier proceed the same way. However contrary to the above no confirmatory
command „B“ will be replied. It is up to master to check whether the new identifier has been accepted, for
example by command “R” (read current value). The R-command is transmitted under the corresponding
identifier to the position display. If the addressed SPA is responding the assignment was successful and the
master can proceed with next identifier. Regarding other commands the display of the respective device
switches to standard operation.