Measurement-computing Micro 488/EX rev.2.1 Instrukcja Użytkownika Pobierz pdf (Strona 79)

Section 5 Command Descriptions

5.9

The system command

, followed by a CR and/or LF, is used to unlock the

Micro488/EX from an inappropriate command. An example of such a command would

be requesting data from a nonexistent device with time outs disabled. It is not

recommended for use but is provide in the Micro488/EX for upward compatability

with other IOtech serial to IEEE controllers. Timeouts are a better method of signaling

bus faults.

When the

command is received, the serial handshake line (RTS) is un-asserted.

It is asserted when the Micro488/EX is capable of buffering commands. If XON/XOFF

handshake is selected, the software handshake state is not modified.

Issuing the

command installs the power-on formats for

DATE

DAY

TIME

and

CASE

and software programmable terminators are returned to the power-on conditions.

Macro and log buffer data is not effected. If a macro has been defined as the

STARTUP

, it will execute. It also is equivalent to issuing the following commands…

DISARM MASK OFF

ERROR OFF REQUEST 0 (with *SRQ)

ID;@ TIME OUT 0

LOG OFF TRACE OFF

The

character, referred to as the '

' character, can be changed or disabled by

using the

command. If it is anticipated that the

character may be part of the

data

within an

OUTPUT

SEND

command, it should be disabled. It is also

recommended that the

character not be involked within a macro.

SYNTAX @

RESPONSE None

MODE Any

BUS STATES None

EXAMPLE PRINT #1,"@"

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 217 218

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