DH Instruments PPC2+, Manual

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PPC2+™ Operation and Maintenance Manual
Page 123
©2001 DH Instruments, Inc.
∗
SRE
Purpose Read or set the Service Request Enable Register.
Command
Query
“
∗
SRE n”
“
∗
SRE?”
Default “
∗
SRE 0”
Arguments n: ’0 to 255’ This is the decimal representation of the bit(s) to enable.
To allow the MAV and ESB bits to assert the SRQ line, the
argument would be 32 + 16 = 48. Bit 6 (64) is reserved and cannot
be set.
Remarks The Service Request Enable Register determines which bits of the Status Byte can
set the MSS bit of the Status Byte and request service by asserting the SRQ line of
the IEEE-488 interface.
Example
(enhanced)
Sent:
Query reply:
“
∗
SRE=48” (enables the MAV and ESB bits)
“48” (no reply if IEEE-488)
Errors ERR# 6: n is not valid.
∗
STB
Purpose
Read the Status Byte Register.
Command “
∗
STB?”
Remarks The Status Byte Register reflects the general status of the PPC2+. The ‘MSS’ bit
state is represented by bit 6.
Example
(enhanced)
Sent:
Reply:
“
∗
STB?”
“80” (The MSS and MAV bits are set)
RSE
Purpose Read or set the Ready Status Enable Register.
Command
Query
“RSE
n”
“RSE?”
Default “RSE 0”
Arguments n: ’0 to 255’ This is the decimal representation of the bit(s) to enable.
To enable the RDY bit, the argument would be 1.
Remarks The Ready Status Enable Register determines which bits in the Ready Status
Register are enabled and included in the Status Byte Register (RSR bit), and can
assert the SRQ line. The reply is in decimal numeric form.
Example
(enhanced)
Sent:
Query reply:
“
∗
RSE=1” (enables the RDY bit)
“1” (no reply if IEEE-488)
Errors ERR# 6: n is not valid.
RSR
Purpose
Read the Ready Status Register.
Command “RSR?”
Remarks The Ready Status Register contents are cleared after reading. The reply is in
decimal numeric form.
Example
(enhanced)
Sent:
Reply:
“RSR?”
“6” (The MEAS and NRDY)