Bronkhorst DeviceNet slave interface - Manual (Page 33)

BRONKHORST ®
Page 33 DeviceNet interface 9.17.026
9 CHANGING MAC ID AND BAUD RATE
When you have installed your Bronkhorst meter/controller DeviceNet slave and made right settings for device
configuration and parameter data, you can give your instrument the MAC ID you want. Default instruments will be
delivered with MAC ID 63. This MAC ID has been agreed by the DeviceNet organisation to be free for installing new
devices to the bus. Changing the MAC ID can be performed in different ways:
9.1 V IA ROTARY SWITCHES ON THE SIDE OF THE INSTRUMENT ( IF PRESENT ).
On the side of the instrument are rotary switches placed and a label
with the explanation of the switches. Make sure to use a screwdriver
which is suited for the switches.
The switches have the following function:
9.1.1 DATA RATE
With the DATA RATE switch the baud rate of the instrument can be set.
Data rate BAUD Rate
1 125kbps (default)
2 250kbps
5 500kbps
P Programmable mode
If the switch is set to P the baud rate is software programmable.
During instrument initialisation, the DATA RATE switch is read. If the switch specifies one of the valid data rates, i.e.
125, 250, 500Kbaud, this value is used. If the specified data rate differs from the value stored in the instrument, the
new data rate is saved in memory. If the switch specifies the programmable mode, the value stored in the
instrument’s memory will be used as the data rate.
9.1.2 NODE ADDRESS (00 – 63 PGM)
With the NODE ADDRESS switch the MAC ID can be set. The MSD is the high part of the decimal number and the LSD
the low part. For instance address 25 means MSD on 2 and LSD on 5. The default address is 63.
During instrument initialisation, the node address switches are read. If the switches specify a valid DeviceNet MAC ID,
i.e. a value from 0 to 63 this value is used. If the specified MAC ID differs from the value stored in the instrument, the
new MAC ID is saved in memory. If the switches specify an invalid DeviceNet MAC ID, i.e. a value greater than 63, the
value stored in the instrument’s memory will be used as the MAC ID.
If the address is set by the switch and it is not on the P position the instrument will respond with error status code 0E
(Attribute not settable) if by software is tried to change the address.