There's a ton of information on the Internet for Schneider/Modicon's modbus protocol, including modbus+., modbusrtu, and modbustcp... Specs are freely available http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf. If you spend 2 minutes with google you'll find more then you'll need. For example: http://www.modbus.pl/download/zxy66/v19/modbus_perl_client.zip. Anyways, enjoy your research...
On Jan 5, 2008 1:01 PM, gmaggro <[EMAIL PROTECTED]> wrote: > OK, having done some digging a decent little chunk of industrial > automation gear has started coming my way; 1 of 6 pieces. All totaled, > roughly under $1000. Small standalone stuff for now; the shipping on > populated PLC chassis like SLC-500 stuff is problematic. > > If people have specific technical questions, want a script run against a > piece of gear or a custom protocol capture done I will entertain such > requests. I am also willing to open the cases and pick up the soldering > iron, attempt rom/firmware dumps, etc. > > Are there any particular tests or tools someone would like me to work > into my routine right from the start? > > Hardware piece #1 is a Kohler Power Systems modbus/ethernet converter, > pn# GM40165. > > So far, nmap (4.52) has been detecting the modbus running on port > 502/tcp as asa-appl-proto. There is not a great deal of information out > there about this protocol. The email contact associated with the port in > some /etc/services files ([EMAIL PROTECTED]) is disabled, and the domain > redirects to an industrial automation company (telemecanique.com). > Running/OS details indicate Enerdis or Lantronix embedded. MAC prefix is > 00:20:4A (Pronet Gmbh). I suppose I could have just posted the nmap > output, but figured that might annoy people unduly. > > Perhaps it would be worth renaming 'asa-appl-proto' on 502 to 'modbus' > or something related? Just a suggestion to make it clearer for some > people. In any case, this is mitigated by scanning with the -C option > which grabs info from 80 and 161 clearly identifying it as being a > modbus related device, the sysDescr stating "Modbus/TCP to RTU Bridge". > And oh yeah, it has a wide open text configuration interface on 9999. > > Handy/Interesting modbus tcp/udp links: > > http://jamod.sourceforge.net/development/tcp_master_howto.html > http://jamod.sourceforge.net/kbase/protocol.html > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/ >
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