Measurement Computing Serial488/4 - Manual (Page 32)

Section 1 Introduction
2.20
2.6 IEEE 488 Bus Implementation
The Serial488/4 implements many of the capabilities defined by the IEEE 488
1978 specification. These are discussed in the follow ing sections. The bus uniline and
multiline commands that the Serial488/4 does not support or respond to include:
Remote Enable (REN) Parallel Poll (PP)
Go to Local (GTL) Parallel Poll Configure (PPC)
Local Lockout (LLO) Parallel Poll Unconfigure (PPU)
Take Control (TCT) Parallel Poll Disable (PPD)
Group Execute Trigger (GET)
2.6.1 My Talk Address (MTA), My Secondary Address (MSA)
The Serial 488/4 is addressed to talk in one of two ways dependent
upon the addressing mode selected. When dual primary addressing mode
is selected, the Serial488/4 is addressed to talk upon receipt of MT
A. If
secondary addressing mode is selected the Serial488/4 is addressed to talk
upon receipt of an MTA and MSA sequence.
When the Serial488/4 is addressed to talk on its command/status
address, it outputs either a U0, Un, or query ( ?) response message
depending on which was last requested. The status output bus terminators
are then appended to the output and EOI is asserted if the status EOI option
was enabled. The Serial488/4 must be readdressed to talk to
perform
subsequent reads.
When the Serial488/4 is addressed to talk on a serial data address, it
retrieves data from the associated serial input buffer and outputs it to the
IEEE bus. If the serial terminator character is encountered and the data
EOI option is enabled ( L0), EOI is asserted on that character. EOI may
also be asserted on the last character in the serial data buffer if
this data
EOI option is enabled (L2).