Pressure Systems, Inc. Model 9116 User’s Manual
Page 90 www.PressureSystems.com
CHANGE MODULE’S IP ADDRESS RESOLUTION METHOD & RE-BOOT
(UDP/IP Command ‘psirarp’)
Purpose: To change (toggle) the current IP address resolution state (ipaarpst) of a
specified module, and then unconditionally “re-boot” it.
Command
“psirarp ethadr”
where ethadr is the Ethernet address of the specified module in the
following special hex-digit format
‘xx-xx-xx-xx-xx-xx’
Response
none (module re-boots)
Description: When a Model 9116 module receives this broadcast command, (by continuously
monitoring port 7000) it responds by toggling its current ARP method to one of
two states: dynamic resolution or static resolution. Then it restarts its firmware.
The result is essentially the same as a power-up restart, in that any TCP/IP
connection is lost, and the module returns to its normal startup state. However, if
it used the static resolution method before it received this command, after the re-
boot, it will not have a valid IP address until an external network server (RARP or
BOOTP) provides it with one. However, executing the command a second time
will restore it to using its original statically-assigned IP address (after another re-
boot finishes).
Just as for the “psireboot” command, the host must wait long enough for the re-
boot process to be completed before it can again request a connection to the
module.
Example:
● Reconfigure a specified module on the network so that it uses its “other” IP
address resolution method, and also re-boot it. Presumably, the host knew the
module’s current state (iparpst) as a result of a recent Network Query response
from the module.
“psirarp 00-E0-8D-00-00-01”
Response:
(None)
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