Hioki BT5525, Инструкция по эксплуатации, Страница: 119 / 215

119
Communications Method
Output queue and input buffer
Output queue
Response messages are stored in the output queue. The output queue is cleared in the following
cases.
• When data is loaded using a controller
• When the instrument is turned on
• When a query error occurs
The instrument output queue can buffer at least 64 B of response messages.
When there is no more buffer space, the query operation is deferred until a response message is
received.
Input buffer
The input buffer can buffer at least 1 KB of communications commands.
When there is no more buffer space, the operation is stopped until space becomes available.
Status system
The status system of the instrument is designed based on the status model defined by IEEE 488.2.
<1>
<2>
<4>
<8>
<16>
<32>
<64>
<128>
<1>
<2>
<4>
<8>
<16>
<32>
<64>
<128>
EV EN
EV EN
OR
OR
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
(2) (3)
(4)
(1)
(5)
Standard Event Status Register Status Byte Register
AND output of
EV and EN
AND output of
EV and EN
Output data available?
(1)
:SYSTem:ERRor?
The value “1” will be set when an error occurs.
(2)
*ESR?
When “1” is set for each bit, the status is retained until the result is
returned after the query is received.
When the
*ESR?
query is returned, each bit is cleared.
When
*CLS
is executed, each bit is cleared.
(3)
*ESE
*ESE?
Masks bits reporting the status of the Standard Event Status Register to
the Status Byte Register.
(4)
*STB?*
The status at the point when
*STB?
is received is returned.
Even though the
*STB?
query result is returned, each bit is not cleared.
(To clear the bits, the query for each event register should be executed to
clear each cause or
*CLS
should be executed.)
(5)
*SRE
*SRE?
Masks bits reporting the status of the Status Byte Register to the Status
Byte Register’s MSS bit (bit 6).
See “Status Byte Register (STB)” (p. 120)
Communications Function
HIOKI BT5525A961-00