Martel Electronics 3001 - Manual (Page 50)

Figure 33 - Status Register Overview
Table 9 lists the status registers and gives the read/write commands and associated mask
registers used to access them.
Table 9 - Status Register Summary
Status Register Read Command Write Command
Serial Poll Status Byte (STB) *STB? —
Service Request Enable Register (SRE) *SRE? *SRE
Event Status Register (ESR) *ESR? —
Event Status Enable Register (ESE) *ESE? *ESE
Each status register and queue has a summary bit in the Serial Poll Status Byte. Enable
registers are used to mask various bits in the status registers and to generate summary
bits in the Serial Poll Status Byte. For IEEE-488 interface operation, the Service Request
Enable Register is used to assert the SRQ control line on detection of any status
condition or conditions that the programmer chooses. For RS-232 interface operation,
the SRQSTR string is sent over the serial interface when the SRQ line is set.
1) Serial Poll Status Byte (STB)
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