If turnaround delay is necessary, i.e. if a certain amount of time is
necessary between the time the 9400A receives the trigger character and
the time it sends the first character, the last parameter of the
RS CONF must be non-zero.
Example: RS CONF 9,13,10,0,I000
with a turnaround delay of 1 second.
The turnaround delay is given in msec, therefore the value of I000
corresponds to 1 sec. Note that during this delay the 94OOA may appear
as dead.
In the second case, i.e. when the controller echoes characters, the
9400A can be configured with the following sequence of commands:
<ESC>
COMM TRAILER OFF
RS CONF 9,13,10,10,0
disables echoing of characters received by the
9400A.
disables trailer.
selects half duplex mode with <TAB> (decimal9)
as trigger (or talk) character, <CR> <LF>
(decimal 13 and I0) as <END> message string,
<LF> as echo character and no turnaround
delay.
Whenever the controller interrogates the 9400A to get one or several
responses or to get one or more blocks of data, it sends the command
followed by <CR> (optional) and <LF> and then by <TAB>. This last
character instructs the 9400A to send one response or one block of
data. To get more information or more blocks <TAB> must be re-sent.
Example:
The computer wants to get the setup configuration. If the 9400A has
been configured to sends blocks of data in hex format in blocks of 300
characters, the computer will receive 3 blocks.
Computer sends: SU ?<CR><LF><TAB>
9400A answers:
#L .......<CR><LF>
Each character including <LF> will be echoed by the computer.
Computer sends:
<TAB>
9400A answers:
#L .......
<CR><LF>
Each character including <LF> will be echoed by the computer.
Computer sends:
<TAB>
9400A answers:
#1<CR><LF>
#1<CR><LF> will be echoed by the computer.
Notice that <LF> is used both as the last character of <END> message
string and as the <ECHO> character. Character strings (except <ESC>
string for DEVICE CLEAR and <ESC>, <ESC>, <ESC>, <ESC>) will be lost if
sent between <TAB> and <LF>.
In both cases, if a service request has been activated, the string will
be sent only when the trigger character is received.
7-41
Remote Operations
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