User guide

Chapter 9
Configuring Online Communication
9–9
Begin at the WHO display. Press[F4], NODE_CFG.
Node Addr. Device Max Addr./Owner
2 5/02 (31)
3 500–20 (31)
4 5/01 (31)
0 APS (31)
Node Addr: 2 Baud Rate: 19200
F1 F2 F3 F4 F5
CHG_ADDR BAUD
OFL
MAX_ADDR
The following functions are available from this menu:
Function Key Description
[F1], CHG_ADDR
Allows you to change the node address of your
HHT or the node address of any active
processor on the DH–485 network. Cycle power
to the processor for your changes to take effect.
[F2], MAX_ADDR
Allows you to set the maximum node address for
your HHT or any active processor on the
network.
[F3], BAUD
Allows you to set or change the communication
rate of your HHT or any active processor on the
network. Cycle power to the processor for the
changes to take effect.
You do not need to cycle power if you change your HHT node address, the
address changes as soon as you press
[ENTER].
Important: Each programming device and processor on a DH–485 network
must have a unique address from 0 through 31. The default
node address of a processor is 1 and a programmer is 0.
Consequences of Changing a Processor Node Address
Remember that the processor node address resides in the status data file
(word S:15) of a program. This means that when you overwrite the contents
of processor memory by using the download function or transfer memory
function, the node address may change as follows:
• Download – When you download a program and cycle processor power,
the node address of the downloaded program takes effect, overwriting the
previous node address.
• Memory Transfer – When you transfer a program from a memory module
to the processor and cycle processor power, the node address of the
transferred file takes effect, overwriting the previous node address.
Important: Immediately after you download a program for transfer a
program from a memory module to the processor, press [F1],
CHG_ADR and re–enter the current node address. Failure to do
this can result in a duplicate or incorrect node address after you
cycle power to the processor.