18
GPIB PROBLEMS
The first requirement for GPIB operation is to
properly attach GPIB cable and to specify the
correct address for the instrument. The default
GPIB address is 15, but any address between 1
and 30 may be set from the front panel. To
check the GPIB address, press the GPIB menu
key twice. A new GPIB address may be entered
by keying in the number and pressing the EXC
key.
The DG535 will respond to commands only if it
is addressed and the Remote Enable line (REN)
is asserted. When this happens, the front panel
goes to the REMote state, which disables all of the
keys except the keyboard mode key, which allows
the user to leave the REMote state.
The program can prevent users from using the
keyboard by asserting the Local-Lockout state
(LLO).
Different GPIB controllers expect different "string
terminators" to finish each response from an
instrument. The default GPIB terminator for the
DG535 is a carriage return and a linefeed with an
EOI. The "GT" command may be used to change
the GPIB terminator if your controller requires a
different one.
