Agilent Technologies E1300B, E1301B, 75000 SERIES B Using DOWNload UPload? to Access Data

Using :DOWNload and

:UPload? to Access

Data

The command DIAG:DOWNload < address> ,< data_block> is used to store data into the NRAM segment. The command

DIAG:UPLoad? < address> ,< byte_count> is used to retrieve data from the NRAM segment. The address parameter in … DOWNload and … UPLoad? can specify any address within the capability of the System Instrument’s control processor. The system does not restrict you from storing or retrieving data which is outside of the NRAM segment.

Caution	This capability to store (DOWNload) data to any location in mainframe memory
	means that you could inadvertently change the contents of memory being used
	by the mainframe control processor. This will occur if:
	• you specify a starting address for DOWNload which is outside the
	NRAM segment
	• you specify a starting address for DOWNload which is inside the NRAM
	segment, but the data block you send extends past the end of the NRAM
	segment.
	If either of these occur, operation of the mainframe will be disrupted. To restore
	operation:
	1. turn the mainframe off and then back on.
	2. while the mainframe is “Testing ROM”, press the Reset Instr button on
	the front panel or, for terminal users, press the CTRL and R keys.
	This operation is the same as executing DIAG:BOOT:COLD

Data Formats for :DOWNload

Data stored into NRAM using :DOWNload can be sent in either Definite, or Indefinite Length Arbitrary Block Program Data formats (see Parameter Types in the beginning of Chapter 5). The Definite Length block format is recommended since the format includes a data length count which positively terminates the :DOWNload command when that count is reached. If the Indefinite Length format’s termination sequence (< newline> with END) is not received correctly, commands sent after the :DOWNload command will be interpreted as more data and sent to memory, possibly overwriting system memory and disrupting mainframe operation.

The following example program will use the small NRAM segment created in the previous example. It will show how to store and retrieve:

•64 ASCII characters

•thirty-two, 8 bit data bytes

•sixteen, 16 bit data words

Using the Mainframe 4-9