Selected read exposure

[CReese]

Is it possible to allow selected read access through an additional COM card? I assume that read/write privileges via MODBUS TCP/IP are the same.

Colin

[franji1]

Yes - create a user account in your Do-more CPU that has Data Read access (not Data Write), along with Program Read.  Anytime THAT user connects, they will only be able to read data.  That user's privilege will apply on ANY comm port, i.e. it is NOT port specific, but SESSION/user specific.

You will probably want to make the "Default" user be data read/program read (i.e. Default User is the user with a blank, or no, password).  Then have your "admin" or your user account (WITH a password), have full access (or whatever access).

See Help Topic DMD0259, Password Configuration for more details.

[CReese]

The type of user access you reference is, if I understand it correctly, for data read/write through DMD software. What I'm referring to is read/write by dumb devices, e.g. from PLC to PLC or read/write from/to DM from a typical MB TCP/IP client. While I'm sure I could hack in a requirement to set a token register before a write operation, it would be nice if I could make an interface read-only.

Colin

[BobO]

There is no way to do that now. It would be pretty easy to add internal flags to the device to inhibit read and write access. You would use DEVREAD and DEVWRITE to access them. No help now though...