HP 5335A - Page 51

iViUUei 3JJJA
Operation and Programming
4. Terse Commands: Type T; A sequence of two ASCII-coded bytes not followed by a
numeric or binary number. Requests a specific function or subroutine to be executed.
For example, the characters "IN” will cause the counter to INitialize all control settings
to default status.
5. Special Commands: Type *; A sequence of two ASCII-coded bytes followed by a
sequence of bytes representing some defined value. For example, the characters
"MOD” will program the Math Offset to the value of the last Display.
3-167. The 5335A DEVICE COMMANDS
3-168. Almost every control on the 5335A can be programmed via the HP-IB. Programming is
accomplished by addressing the counter as a listener and sending it device commands. Table3~6
shows the complete set of device commands. The commands are organized into functional
groups for ease of description and use.
3-169. Commands may be sent upper or lower case. To separate commands, you may use
nothing at all or you may use any combination of spaces, commas, semicolons, carriage returns,
and line feeds. Spaces are not allowed within a command name. At least one of the separation
characters must follow the end of command strings. Usually this is the carriage return and line
feed characters sent automatically by a write statement. For example, the command:
9825A 9835A/45A
wrt 703, "RE” OUTPUT 703; "RE”
addresses the counter as a listener and sends it the command to reset. The "wrt” (and OUTPUT)
instruction automatically follows the "RE” with a carriage return and a line feed. The one
exception to most of these rules is binary programming, which uses the “wtb” (or WRITE BIN)
instruction. For further information on binary programming refer to Learn Mode Programming,
paragraph 3-181.
3-170. Function Selection FU, FN
3-171. This selects the function. Functions 1 through 16 are the normal functions found on
the front panel. Functions above 16 are special functions (see Special Functions). These are
provided to enhance system measurements. FU99 accesses the diagnostic mode. Diagnostics
are covered in Section VIII.
3-172. Gate Time Setting GA, GO, GC
3-173. This GA command is used to set the gate time remotely. The range of times is from about
1 ms to about one second. Resolution of the setting is about 2 ms, and accuracy is about 2%±2 ms.
For programmed gate times greater than one second, use GO and GC, to open and close the gate
"manually”:
9825A 9835/45A
wrt 703. "GO”
WAIT 30000
wrt 703; "GC”
OUTPUT 703; "GO”
WAIT 30000
OUTPUT 703; "GC”
This can be useful for totalizing and for extremely long gate times.
NOTE
The 5335A makes no distinction between the GO and GC com¬
mand. Each time either of these two are received the 5335A
treats it like the pressing of MANUAL Gate Mode key.
3-35
k a _ t„l rnct