I D
Identification Number
Set the device
ID
entification number. This command is used to set a unique PPT address and/or a
group address. Two sections describe this command based on the RS-232 or RS-485 type of unit.
(Default: device
ID=00
,
group address=90
)
RS-232 type only
To unassign all device IDs, send a
*99WE
and a
*99ID=00
command. In this case, all the PPT units
in the network will set their device IDs to address ‘00’, the null address.
To sequentially assign device IDs to a RS-232 ring network, send a
*99ID=01
to the first unit. That
unit will number itself
ID
=01, increment the command and automatically send a
*99ID=02
to the
next PPT in line. This will continue down the ring until all of the PPTs have sequentially numbered
themselves. The host processor will receive:
*99ID=nn
, where nn= the number of PPT units in the
network plus 1. For example, if 6 PPTs are connected in a network, then a
*99ID=01
command will
sequentially assign device IDs to all six units and return a
*99ID=07
to the host processor. Note that
ID=01 must be entered and not just ID=1. The PPTs will now be sequentially assigned device IDs
from 01 to 06.
Inquiry: *dd
ID
(reply is group number)
Action: *dd
WE
*dd
ID=
newNumber
EEPROM Store: *dd
WE
*dd
SP=ALL
newNumber
00 – 99 (must enter a
TWO
digit decimal number)
where: 00
Unit numbers itself ‘00’ (null address) and transmits the message unchanged. A
*99ID=00
will change all PPTs in network to null address (see
Note
above).
01-88
Unit numbers itself with device ID
newNumber
, increments the number by 1, and
transmits the message. This will sequentially number all PPTs in a network, starting
from unit dd, with ID=
newNumber
(see
Note
above).
89
Unit numbers itself with device ID ‘89’, changes the number to ‘99’, and transmits
the message.
90-98
Unit assigns itself group address
newNumber
, and transmits the message un-
changed.
99
Unit does not change its address, changes
newNumber
to ‘ER’ and transmits the
message.
ER
Unit does not change its address and transmits the message unchanged.
RS-485 type only
If a RS-485 unit has the factory default identification address of 00, the PPT can not respond to
group or global commands until it is assigned a valid address. This can be accomplished by one of
three methods:
1)
An identification address can be assigned off-line by connecting the PPT to an RS-485 compatible
serial port. The command sequence to assign address 01 is:
*00WE
*00ID=01
*01WE
*01SP=ALL
If global addressing is to be used for PPT responses, then all PPT’s that are to respond to global
requests must be addressed sequentially starting with address 01. See the
TO
command
description
for further information on RS-485 global addressing.
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