Command Pass Through Register (Cptr); Table 4-3. Multiline Gpib Commands Recognized By The Μpd7210 - National Instruments Corporation GPIB-1014P User Manual

Register Bit Descriptions

Command Pass Through Register (CPTR)

VMEbus Address:
Attributes:
7 6
CPT7 CPT6
Bit Mnemonic
7-0r CPT[7-0]
GPIB-1014P User Manual
Base Address + B (hex)
Read Only
5 4
CPT5 CPT4
Description
Command Pass Through Bits 7 through 0
These bits are used to transfer undefined multiline GPIB command
messages from the GPIB DIO lines to the computer. When the CPT
feature is enabled (CPT ENAB=1, AUXRB[0]w), any GPIB Primary
Command Group (PCG) message not decoded by the TLC is treated as
an undefined command. The multiline GPIB commands recognized by
the µPD7210 are listed in Table 4-3. All GPIB Secondary Command
Group (SCG) messages following an undefined GPIB PCG message are
also treated as undefined. In such a case, when an undefined GPIB
message is encountered, it is held in the CPTR and the TLC Acceptor
Handshake function is held off (in ACDS) until the Valid auxiliary
command is written to the AUXMR. The CPTR is also used to inspect
secondary addresses when mode 3 addressing is used. The TLC
Acceptor Handshake function is held off (in ACDS) until the Valid or
Non-Valid auxiliary command is written to the AUXMR.
Table 4-3. Multiline GPIB Commands Recognized by the µPD7210
Hex Number
01
04
05
08
3 2
CPT3 CPT2
Message Description
GTL Go To Local
SDC Selected Device Clear
PPC Parallel Poll Configure
GET Group Execute Trigger
4-26 © National Instruments Corporation
Section Four
1 0
R
CPT1 CPT0
(continues)