Texas Instruments CBL

54 CBLé System Guidebook
About CMD7—Request Status
CMD7 Operations
CMD7
creates a data list of CBL status information, which can then be
sent to a calculator. The only element in the list is a 7.
List Syntax
{7}
Request Status
This command creates a list showing system status and sets up the CBL
to clear any displayed error messages. The following items are created in
the list:
¦ Device code: 1 (device code identifier)
¦ Last error code: 0–99 (0=no errors)
¦
AutoIDENT
resistance values for
CH1
,
CH2
,
CH3
, and
CH11
in Kohms
(999 Kohms = open)
¦ List of all active channels
To create a list showing the system status of the CBL and to clear any
error messages, send a
CMD7
, and then retrieve the list. Any error
condition except
POS
(Power-on Short, page 57) is cleared, when the
list is retrieved.
Note: If an error condition exists, the CBL will not respond to calculator
commands (except
CMD0
or
CMD7
) until the error condition is cleared.
Pressing P or sending an All Clear command (
CMD0
) also clears
any error condition and displayed error message.
Request Status Example
{7}üL
Send(L)
Send
CMD7
to the CBL to create a system status
list and set up the CBL to clear any displayed error
messages.
Get(L)
Retrieve the list created by
CMD7
and store it to L
1
in the calculator. Clear any active error messages
from the CBL display.
Note: The list created by
CMD7
is available for retrieving into a
calculator until the next command invalidates the list. Therefore, you
should retrieve this list immediately following a Request Status
command.