Ecom Instruments MCAL 4200 Instruction Manual page 74

7.3-4 Calibrator Status
Status registers, enable registers, and queues provide status information on the calibrator. Each
status register and queue has a summary bit in the Serial Poll Status Byte. Enable registers
generate summary bits in the Serial Poll Status Byte. The following is a list of registers and
queues along with their function.
Serial Poll Status Byte (STB)
The STB is sent when the calibrator responds to the *STB? command.
Service Request Enable Register (SRE)
Enables or disables the bits of the STB. Cleared when power is reset. Setting bits to 0 disables
them in the STB. Setting the bits to 1 enables them. Bit assignments for the SRE and the STB
are shown below.
7 6
0 MSS
MSS
Master Summary Status. Set to 1 when ESB or EAV are 1 (enabled). Read using the
*STB? command.
ESB
Set to 1 when at least one bit in ESR is 1.
EAV
Error Available. An error has been entered into the error queue, and may be read
using the Fault? command.
Event Status Register (ESR)
A two-byte register, in which the lower bits represent conditions of the Calibrator. Cleared when
read and when power is reset.
Event Status Enable Register (ESE)
Enables and disables bits in the ESR. Setting a bit to 1 enables the corresponding bit in the
ESR, and setting it to 0 disables the corresponding bit. Cleared at power reset. Bit assignments
for the ESR and the ESE respectively are shown below.
15 14
0 0
7 6
PON 0
PON
Power On. Set to 1 if power was turned on and off before the Event Status Register
was read.
5 4
ESB 0
13 12
0 0
5 4
CME EXE
3 2
EAV 0
11 10
0 0
3 2
DDE QYE
1 0
0 0
9 8
0 0
1 0
0 OPC
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