User`s manual

128
Chapter 5 Remote Interface Reference
3488 Mode Commands
5
SREAD <slot><register>
Reads data from the input port on a 44475A Breadboard in the specified
slot. The data read back is in the form of a decimal number which is the
sum of the binary weighted values of the bits that are high (+5 volts).
This command is for 44475A Breadboard only.
The slot parameter is a decimal ranging from 0 to 9 (mainframe
dependent). Valid slot numbers are:
Two 8-bit ports are available on the 44475A Breadboard. One port is a
static read only port (04), the second port is static write only (00). Static
means that there is no handshaking involved in data transfers.
The register parameter value is 04. If a number other than 04 is used
(any value between 0 and 7 will not cause an instrument error), the
value 255 will be returned.
OUTPUT 709; “SREAD 304”
! Breadboard in Slot 3.
ENTER 709; A
DISP A
3499A slots 0 through 5
3499B slots 0 through 2
3499C slots 0 through 9