VTI Instruments EX1000A, User Manual

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VTI Instruments Corp.
100 EX10xxA Programming
Once a lock has been acquired, it is released with the vtex10xxA_unlock function. The lock status
is not affected by the vtex10xxA_reset function, and it cannot be used to release a lock.
By design, the locking mechanism is able to be overridden by a secondary host that issues a
vtex10xxA_break_lock function. Thus, the lock provides a warning to other users that the unit is
in a protected operation state, but not absolute security. This allows for instrument recovery if the
locking IP address would become disabled. Breaking a lock, however, does not automatically
acquire it. That must be done with a separate
vtex10xxA_lock function.
The lock status of the instrument is queried with the vtex10xxA_check_lock query. The response
to the query not only indicates whether the unit is locked, but also if the lock is owned by the issuer
of the query.
C
ONFIGURE THE
S
CAN
L
IST
The scan list is defined with the vtex10xxA_set_scanlist function. The EX10xxA can be configured
to include from 1 to all 48 of its input channels in the scan list. A valid scan list consists of:

at least one channel

no more than 48 channels

no repeated channels
The channels in the scan list can be listed in any order, but will be scanned in numerical order when
the scan list is executed.
Example #1: This code block configures a five-channel scan of channels 0 through 4 in sequential
order.
ViInt32 channels[5] = { 0, 1, 2, 3, 4 };
vtex10xxA_set_scanlist(vi, channels, 5);
Example #2: This code block configures a five-channel scan of channels 0 through 4 in reverse
order.
ViInt32 channels[5] = { 4, 3, 2, 1, 0 };
vtex10xxA_set_scanlist(vi, channels, 5);
The current scan list is queried with the Vtex10xxA_get_scanlist function.
C
ONFIGURE THE
EU C
ONVERSIONS
The EU conversion for each thermocouple channel is configured with the
vtex10xxA_set_channel_conversion
function. A channel’s EU conversion can be configured
regardless of its inclusion in the scan list, and multiple channels can be assigned to a specific
conversion type within one function. However, each unique conversion type must be set with a
separate function.
Example: This code block configures channels 0 through 4 for thermocouple type E and channels 5
through 8 for thermocouple type T.
#define TYPE_E 0x04
#define TYPE_T 0x03
ViInt32 e_channels[5] = { 0, 1, 2, 3, 4 };
vtex10xxA_set_channel_conversion(vi, e_channels, 5, TYPE_E);
ViInt32 t_channels[4] = { 5, 6, 7, 8 };
vtex10xxA_set_channel_conversion(vi, t_channels, 4, TYPE_T);
The current EU conversion assignment for any channel is queried with the
vtex10xxA_get_channel_conversion query.