User`s manual

NIOP - Network I/O Physical

3-153

You may also enter a special character, either at the prompt or after

typing new data, for

scrolling through the fields. The special

characters are:

The NIOP command utilizes the necessary configuration

parameters to perform the TFTP file transfer. Prompts appear for

entering the parameters. Refer to NIOT - Network I/O Teach

(Configuration) on page 3-156 for a description of the parameters.

Note that winding (indexing) into a file is possible on a read (get),

there is a drawback in this feature due to the nature of TFTP, the

entire file is transferred across the network. But only the desired

section of the file is written to the user memory.

Refer to the DARPA Internet Request for Comments RFC-783 for

the description of the TFTP protocol. Prior to the TFTP session an

ARP request is transmitted for the hardware (Ethernet) address of

the server.

At time-out conditions the file transfer process can be aborted by

pressing the BREAK key on the console keyboard or by pressing the

abort switch on the front panel.

Note The clock must be running in order for this command

to work properly. Use TIME ;L to see if the clock is

running. Use the SET command to start and initialize

the clock.

The field prompts are shown below.

V or v Open the next Þeld. This is the default, and remains in

effect until changed by entering one of the other special

characters.

^ Back up and open the previous Þeld

= Re-open the same Þeld

. Terminate the NIOP command, and return control to the

debugger