User Manual
Miscellaneous Commands
*IDN?
Returns the instrument identification in the form <name>, <model>, 0, <version><rmt>
where <name> is the manufacturer’s name, <model> is the type of instrument and
<version> is the revision of the firmware installed.
I?
Identify Query. Returns the instrument model number only.
*RST
Resets the instrument to its power-on default values and sets the Threshold Level to the
midway ‘AC' position. Also empties remote I/O queues and clears error status.
R
Reset measurement. Performs the same operation as pressing the front panel RESET key
under the same conditions.
S?
Status Query. Reads and returns the instrument status. The response is sent immediately.
The response is xy<rmt>, where x and y are numeric digits expressed in ASCII format. The
first digit is the status byte and is a bit significant value in the range 0 to 7. The meaning of
each bit is as follows:
bit 0 External standard connected.
bit 1 An error has occurred.
bit 2 A continuously updated bit indicating that an input signal is being counted. It does
not necessarily guarantee that there is sufficient signal for an accurate result.
The second byte contains the error number of the last error that occurred. The value is
cleared to zero after each status query. Error numbers are as follows:
0 No error has occurred since the last status query.
1 A command syntax error – one or more commands ignored.
LOCAL
Returns the instrument to local operation and unlocks the keyboard.
UD <data>
Store user data; maximum string length 250 characters. The string may contain any
character between 20H and FFH inclusive except 3BH (;). Can be used to give the
instrument an identifying or information data string which can be queried using the UD?
command. Examples of use are Serial No., calibration due date, owner’s name, etc.
UD?
Returns user data from store.
Remote Command Summary
The commands of the TF830, all of which have been implemented on this instrument, are identified by
“TF830” on the right-hand side.
F0
B Input period.
F1
A Input period. TF830
F2
A Input frequency. TF830
F3
B Input frequency. TF830
F4 Frequency ratio B:A.
TF830
F5
A Input width High. TF830
F6
A Input width Low. TF830
F7
A Input count. TF830
F8 A Input ratio H:L.
F9
A Input duty cycle.
AC
A input AC coupled.
DC
A input DC coupled.
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