BNC 6040 - Manual (Page 36)

36
OPERATING INFORMATION
ES Error Status. This returns a single byte that flags any errors that have occurred since the
previous
ES command. All bits are set to zero following this instruction. The bit
definitions are as follows.
Error Status Byte:
Bit Description
7 Always zero
6 Always zero
5 Always zero
4 Always zero
3 Always zero
2 Always zero
1 Overrange
0 Unrecognized command
Bits 2-7:
These bits are always zero and are reserved for future use.
Bit 1: This is set if a parameter was set to a value outside its allowable
boundary. For example, if the command
TR IN -5 is sent (set
internal rep-rate generator for -5 Hz), the value would be discarded and
bit 1 would be set.
Bit 0:
This bit is set if the command is unrecognized.
IS Instrument Status. This returns the instrument status byte.
Instrument Status Byte:
Bit
Description
7 Always zero
6 Always zero
5 Always zero
4 Always zero
3 External Trigger has been recognized
2 Overlap
1 PLL out of lock
0 Timing cycle in progress
Bits 4-7: These bits are always zero and are reserved for future use.
Bit 3: This bit is set if a trigger has occurred that generated a timing cycle.
Bit 2: This bit is set if a trigger has occurred and no timing cycle has been
generated.