Hameg HM8112-3 Manual page 51

Function 9 (Storage) controls the results memory. Single
trigger (0161) or buffer (01A1) modes will not affect the
memory. The results memory may be written to and read
independently.
– Parameter 0 stops the storage of results.
– Parameter 1 starts the storage. Locations are used
starting from 1 always using the next free one up to a
maximum of 15. The memory header contains the function,
the range, and the measurement time.
– Parameter 2 causes the transmission of all results
contained in a memory which first must be selected by the
command 01BX. This transmission will not be interrupted
by any new results. If a memory shall be read several times
it has to be selected each time by the command 01BX.
– Parameter 3 will cause transmission of the next result
(starting with the first one) of a memory which first must
be selected by the command 01BX. This command allows
to control the speed of result transmission.
– Parameter 4 will erase the complete result memory.
– Parameters 5 to 7 are status informations. 0195 signals
the end of result transmission from a memory. 0196 signals
that a memory selected by 01BX is empty. 0197 signals
that either all 32,000 locations or all 15 records are
occupied.
Function A (Buffer) controls the result buffer. Results will not
any more be transmitted automatically, instead they are
stored in a ring buffer which holds the last 15 results.
Unless the results are fetched by the commands 01A2 or
01A3 the oldest result will be overwritten. In case the
autostatus function is selected the transmission of status
information will be inhibited, this information will be lost
(see commands 02C4 and 02C5). Without a command from
the controlling unit the instrument will not transmit any
information.
– Parameter 0 turns the buffer off.
– Parameter 1 turns the buffer on.
– Parameter 2 will cause transmission of all results in the
buffer.After the last result was sent the message 01A6
(buffer empty) will be transmitted.
– Parameter 3 issues the oldest result in the buffer memory.
After transmission of the last result the message 01A6
(buffer empty) will be transmitted.
– Parameter 4 erases the buffer. This is necessary after any
change of function or range as it is no longer possible to
identify function or/and range of each result. The same
holds for other changes of parameters like measurement
time, filter etc.
– Parameter 5 will erase the buffer automatically after any
command of group 0 and the commands 0108 or 0109. The
command 01A4 will disable this function.
– Paraneter 6 will inform that the buffer is empty.
Function B (record no.)
– Parameters 1 to F select a result memory which then may
be read by Storage Dump (0192) or Storage Single Dump
(0193). The function 01BX will send an information about
the header of the memory selected using the form 0XX for
function and range and 011X for the measurement time.
In case a memory selected is empty 0196 will be
transmitted. The instrument will automatically number the
memories starting with 1.
Function C (Temp Comp) defines the reference compensation
method in case of temperature measurement with
thermocouples.
– Parameter 0 compensates for the reference joint at 0
degrees C.
D a t a
– Parameter 1 (23 degr. C) assumes a reference joint
temperature of 23 degr. C.
– Parameter 2 (FRONT) takes the last temperature mea-
surement result from a PT100 or PT1000 measurement
(2- or 4-wire) and uses it for compensation. When using a
2-wire-sensor a PT sensor and a thermocouple may be
connected simultaneously thus allowing switching back
and forth.
Function F (Test):
– Parameter 1 causes a RAM test which does not destroy
any data. The test result will be transmitted either with
01F4 (RAM GOOD) or 01F5 (RAM FAIL).
Group 2 selects the interface modes and diverse information.
Using a IEEE interface (HO880) the baud rate has to be set to
9600 baud.
Function 2 (Com) will be stored in the E2PROM (default value
9600).
– Parameter 0 turns transmission off.
– Parameter 3 selects 9600 Baud and turns the transmission
on.
– Parameter 4 selects 19200 Baud and turns the trans-
mission on. This baud rate is mandatory for 10 ms
measurement time and transmission.
Function C (Message) delivers instrument status information.
– Parameter 2 will transmit the complete instrument status.
In turn information of groups 0 and 11 to 15 will be
transmitted. The status informations 0197, 0198, and 01A6
will be transmitted if they were activated. The command
02C2 will cause the transmission of the following
informations:
Answers:
00XX Measurement
functions
010X Autoranging
011X Measurement time
012X Filter length
014X Math program
016X Trigger mode
018X Temp. Selection
019X Results memory
019X Results memory
019X Results memory
01AX Results buffer
01AX Results buffer
01CX Temp. compensation 0,1,2
– Parameter 3 disables the auto status function (02D4) and
the continuous status function (02D5).
– Parameter 4 turns the auto status function (02D4) on. The
continuous status function (02D5) will be disabled if active.
If commands are sent via the interface all commands of
groups 0 and 1 will be echoed immediately, asynchronously
to the measurements. If commands are received which
are not implemented 02DX will be sent (helpful when
looking for errors in the control program). The following
informations will be issued immediately after any keyboard
operation or in case of, e.g., result memory full, auto range:
00XX, 0100, 0101, 0111-7, 0140, 0147, 0148, 0182-5, 0190,
0191, 0198, 01C1, 01C2.
C o m m u n i c a t i o n
PARAMETER:
0-6, 9 Ranges and sensors
0,1 Off or On
1-7 10 ms to 60 s
0-4 Off, 2 to 16
0-3, 7,8 Off, Offset, High
Limit, Low Limit,
Max, Min.
0,1 single or auto
4,5 degree C or F
0,1 Off or On
7 Full
8 Single result storage
0,1 Off or On
5 Autoclear selected
External, 23 degr. C,
PT
Subject to change without notice
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