Infratek SM201, User Manual, Page: 16 / 28

The output data can also be a scaling factor, an instrument setting, a range indication, or an error
number.
6-5 6-6
6.6.4. OPTIMIZING SPEED FOR DATA TRANSFER
There may be applications where the speed of data transfer to the host becomes an issue. The
speed is increased when you configure the display monitor without graphic area. Avoid
communications of unnecessary status commands. For highest speed focus on sending queries for
data transfer and reading data from the instrument.
6.7. SERVICE REQUESTS AND STATUS REGISTERS
Service requests let the Spectral Multimeter on the IEEE-488 bus get the attention of the host.
Every instrument or the IEEE-bus can set the service request (SRQ) bus line.
The host can determine which instrument made the request by taking a „
serial poll“ . In this
process the Status Byte Register will be set to 1, identifying it as an instrument that requested
service.
Below the registers are summarized:
STATUS AND EVENT REGISTER DEFINITION
Power ON
User ReQuest (not used)
CoMmand Error
Execution Error
Device Dependant Error
Query Error (not used)
ReQuest Control (not used)
Operation complete
ESR *ESR?
(Event Status Read only
PON URQ CME EXE DDE QYE RQC OPC
7 6 5 4 3 2 1 0
Register)
& & & & & & & & Logical AND
ESE *ESE
[
0...255
]
(Event Status *ESE?
PON URQ CME EXE DDE QYE RQC OPC
7 6 5 4 3 2 1 0
Enable Register) Read and write
Error Status Byte
Message available
RQS
STB ESB MAV *STB?
(Status Byte 7 6 5 4 3 2 1 0 Read only
Register) MSS
& & & & & & & & Logical AND
SRE ESB MAV *SBR
[
0...255
]
(Service Request 7 6 5 4 3 2 1 0 *SBR?
Enable Register) Read and write
Register Description
STB Status Byte Register Read only. Bit 6 sets SRQ bus line.
Read by Serial Poll.
SRE Service Request Read and write. A bit set to 1
Enable Register in SRE will generate an SRQ when corresponding bit
in STB is also 1.
ESR Event Status Register Read only. Assigns specific events to specific bits.
ESE Event Status Read and wirte. Mask for event generation to set
Enable Register Event Summary Bit.