488 CONTROLLER
38
Terminators
term
Any single character, specified as
CR
,
LF
,
'X
, or
$char
as described previously. Part
of terminator sequence used to mark data and commands’ lines’ ends.
[term]
An optional
term
character.
term[term]
, means that one or two terminators may
be specified.
EOI
The IEEE bus End-Or-Identify signal. When asserted during the transfer of a
character, EOI signals that that character is the last in the transfer. On input, EOI,
if specified, causes the input to stop. On output, EOI causes the bus EOI signal to
be asserted during transmission of the last character.
NONE
The no-end-of-line-character indicator. When STERM NONE is specified, the 488
Controller does not append any serial output terminator(s) to serially transmitted
data.
5.2.2 R
ESPONSE
The command description’s response section describes the response that the user’s program should read
from the serial host’s COM port after sending the command. If a response is provided, it must be read to
maintain proper program sequence.
5.2.3 M
ODE
This command description section specifies the operating modes in which the command is valid.
The 488 Controller may be configured as the System Controller, in which case it will initially be the Active
Controller, or as a Not System Controller, in which case it will initially be in the Peripheral state. The 488
Controller configuration as System Controller or Not System Controller is fixed by a hardware switch setting
and cannot be changed by software, but the 488 Controller can change between Active Controller and
Peripheral as required (see
Chapter 4
).
The modes are referred to by their names and states, as given in the table below:
Description
State
System Controller
SC
Not System Controller
*SC
Active Controller
CA
Peripheral (Not Active Controller)
*CA
Active System Controller
SCCA
System Controller, Not Active Controller
SC*CA
Not System Controller, Not Active Controller
*SC*CA
Not System Controller, Active Controller
*SCCA
Содержание 488 Controller
Страница 94: ...488 CONTROLLER 92 9 2 Board Layout Figure 9 1 The 488 Controller s motherboard...
Страница 95: ...93 CHAPTER 9 Theory of Operation Board Layout Figure 9 2 The interface converter s serial I O board...
Страница 102: ...488 CONTROLLER 100 How To Read the Chart Hexadecimal Decimal Equivalent Equivalent ASCII Character Address or Command...
