AMI 420, Installation, Operation And Maintenance Instructions, Page: 108 / 134

90
Rev. 7
Remote Interface Reference
Trigger Control and Queries
4.5.8 Trigger Functions
The Model 420 provides trigger functions which provide a means of
collecting operational data with a minimum of commands and directing
the output to either or both remote interfaces.
4.5.8.1 Description of the Trigger Functions
The Model 420 defines a trigger enable register, very similar to the enable
registers of the status system, which controls which data is output and the
interface to which the data is presented. The trigger enable register is
defined as shown in Table 4-6.
To enable the trigger functions, the
*ETE <
enable_value
>
command is
written with a decimal value corresponding to the binary-weighted sum of
the desired functions. Upon receipt of the low-level IEEE-488 bus trigger
or the
*TRG
command, the Model 420 places the return data in the
appropriate output buffer(s). Data placed in the serial interface buffer is
transmitted immediately. Data placed in the IEEE-488 output buffer must
be collected by the host device. Note that trigger output data may be
placed in both the serial and the IEEE-488 output buffers if desired.
Table 4-6. Bit definitions for the Model 420 trigger functions.
Bit Number
Decimal
Value Definition
0 Magnet Voltage 1 Magnet voltage in volts is included in
trigger output.
1 Magnet Current 2 Magnet current in amperes is included
in the trigger output.
2 Magnet Field 4 Magnet field in kilogauss or Tesla (per
the selected field units) is included in
the trigger output.
3 Time 8 The trigger time is included in the
trigger output in the form hh:mm:ss.ss.
4 Not Used 16 Reserved for future use.
5 Formatted Output 32 The trigger output data is formatted.
6 Serial Interface 64 Trigger output data is placed in the
serial interface output buffer and
transmitted immediately.
7 IEEE-488 Interface 128 Trigger output data is placed in the
IEEE-488 output buffer.