Status Byte And Serial Polling; Status Byte; Bit B0, Data Ready - Keithley 4200A-SCS Reference Manual

Section 9: Keithley External Control Interface (KXCI)
Measure mode
Z = V
I
Reading (mantissa and exponent)
±N.NNNN E±NN
Scientific notation for the reading exponent:
E+00 = 0
-3
E-03 = 10 (m)
-6
E-06 = 10 (µ)
-9
E-09 = 10 (n)
-12
E-12 = 10

Status byte and serial polling

The status byte is an 8-bit register that provides status information on instrument operation. When a
particular operating condition occurs, one or more bits of the status byte sets.
You can use serial polling to read the status byte.
The following sections describe the status byte and serial polling.

Status byte

The status byte is an 8-bit register that provides status information on instrument operation. When a
particular operating condition occurs, one or more bits of the status byte sets. The status byte register
is shown in the following table.
Status Byte Register
Bit
Condition
Binary Value
Decimal Weight
The four used bits of the status byte register are described in the following topics.

Bit B0, Data Ready

This bit sets (1) when all measurements are completed and data is ready to be output on the GPIB.
Any of the following actions clear (0) bit B0:
•
Clears (0) when the data transfer starts.
•
Clears (0) when the BC (buffer clear) command is sent to the 4200A-SCS.
•
Clears (0) when the 4200A-SCS is serial polled.
9-54
Voltage
Current
(p)
B7 B6 B5
— RQS —
— 0/1 —
— 64 —
Model 4200A-SCS Parameter Analyzer Reference Manual
B4 B3 B2 B1
Busy — — Syntax
Error
0/1 — — 0/1
16 — — 2
4200A-901-01 Rev. C / February 2017
B0
Data
Ready
0/1
1