If group addressing is to be used for PPT responses, then all PPT’s within a single group must have a
group sub-addresses assigned sequentially starting with address 01. The command sequence to
assign group address 91 and sub-address 01 to a PPT with identification address 03 is:
*03WE
*03ID=9101
*03WE
*03SP=ALL
See the
TO
command description for further information on RS-485 global addressing.
2)
If the PPTs to receive ID addresses have null addresses, they can be installed on the RS-485 bus
one at a time
. After each PPT is connected, its ID address can be assigned by using the above proce-
dure.
3)
Any number of null addressed, or unknown addressed, PPTs can be connected to a RS-485 bus and
have ID individually assigned by using their serial numbers as unique identifiers. The command
sequence to assign the address 02 to a PPT with serial number 3175 is:
*99WE
*99S=00003175
(must use all 8 numbers)
*99WE
*99ID=02
*02WE
*02SP=ALL
When the identification address has been assigned, group address and sub-address can be assigned
in the same manner as in
1)
above.
Note:
For RS-485 units, all
*9xID=
commands are ignored unless the command has been preceded
by a serial number command (
*99S=
ssssssss) with the serial number that matches that unit. The
next
*9xID
command will set that unit’s device ID number.
I N
Initialize PPT Microprocessor
This command
IN
itializes the PPT microprocessor. When this command is sent with the RESET
option, it performs the same start-up function as removing and re-applying power to the PPT (excep-
tions to this are described in the
MO
command).
Action:
* d d
I N
This stops a continuous read operation but does not perform a power-on reset. All RAM
stored parameters are retained.
Action: *dd
IN=RESET
This stops any current operation and then performs a power-on reset. If the command has a
group or global address (90-99), the message is re-transmitted before the power-on reset is
activated. All RAM parameters are replaced with EEPROM stored parameters. See
MO
command for reset options.
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