Measurement Specialties 9116 Command Psirarp ethadr, Psirarp 00-E0-8D-00-00-01 Response None

Pressure Systems, Inc. Model 9116 User’s Manual

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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