45
Users Manual
Table
Bit No.
0
1
2
3
4
5
6
7
Name
Not used.
Not used.
Not used.
Not used.
Message Available (MAV)
Event Status (ESB)
Master Summary Status† (MSS)
Not used.
True (Set to 1) Condition
Always set to 0.
Always set to 0.
Always set to 0.
Always set to 0.
Data is available in the output buffer. Bit set to 1 when response to query placed in output buffer. Bit cleared (set to 0) when output terminator sent to host.
One or more of enabled events in the Event Status Register have occurred. To determine which events have occurred, send the meter "*ERR?" to read the Event Status Register.
Set to 1 if any enabled bit in the STB (MSS) register is set to 1, otherwise set to 0. Status of MSS bit returned by STB? query command.
Request Service (RQS) Set to 1 if service requested from front panel or MSS set to 1. Status of bit returned by serial poll, which clears RQS.
Always set to 0.
† As read by *STB? command. If the Status Byte Register is read by a serial poll, bit 6 is returned as RQS.
Service Request Enable Register
The SRE Register is an
The meter may be programmed to make a service request on errors or when output is available. Conditions that trigger a service request are specified by writing a binary- weighted value to the SRE Register, using the "*SRE" command.
EXAMPLE | EXPLANATION |
*SRE 16 | Enables the generation of an SRQ when bit 4 (MAY) in the Status |
| Byte Register is set to 1. 16 is the decimal equivalent of 00010000 |
| binary. This means that bit 4 in SRE Register (that corresponds to the |
| MAV bit in the Status Byte Register) is I and all other bits are 0. |
EXAMPLE | EXPLANATION |
*SRE 48 | Enables the generation of an SRQ when bits 4 and 5 (MAV and |
| ESB) in the Status Byte Register are set to 1. The binary equivalent |
| of 48 is 00110000, indicating that bits 4 and 5 are set to 1. |
If any bit in the SRE is set to 1, the RQS bit (bit 6) in the Status Byte Register is enabled, meaning a service request can be generated when the appropriate bits in STB become 1. At
Use the "*SRE?" query (see Table