Entering Remote Computer Interface Mode
When a command or query
is
received by the GPIB or RS232 interface ports,
the 2832-C automatically goes into remote interface mode. When the meter is
in the remote mode, the right-most character of the secondary channel
display area will display an asterisk,
>[
.
The local-lockout mode is designated
-
by displaying
l>i(l
at the right side
of
the secondary channel display area.
-
While in remote mode, the keypad
is
disabled except for the power and
<(LOCAL)> key. To get out of remote mode press the <(LOCAL)> key.
If
the
2832-C is in local lockout then the LLO remote command must be used to
disable local lockout before you will be able to return to keypad control.
The message area
of
the display will indicate when'the keypad is in local
-
lockout state by displaying as the right-most character.
-
RS232C Communication
Before communicating with the 2832-C through the RS232 port, proper cable
connections must be made. Figure 10 shows the cable connections for
communicating with the RS232C port on the 28324.
Once cable connections are made, the baud rate and echo mode need to be
set. Valid baud rates are
19.2K, 9600,4800,2400, and 1200. The parity, data
bits, and stop bits are fixed at no parity,
8
data bits, and
1
stop bit.
RS232C
Parameters
Baud Rate
19.2K, 9600,4800,2400, or 1200
Parity none
8
Data bits
Stop bits 1
When the echo mode
is
enabled the 283242 generates a
'>
'
prompt for every
new line and all characters sent to the 2832-C are echoed back over the
interface. Error messages are reported over the interface immediately.
As
the
user
is
entering commands the line may be edited by using the backspace key
(sending an ASCII decimal 08 code) or by using the DEL key (sending
an
ASCII
decimal 127 code).
In echo mode the
RS232C port
is
interactive and especially useful when a
dumb terminal type
of
device
is
used to communicate with the 28324.
When echo mode
is
disabled (normal mode) the 2832-C does not generate
a
prompt or echo characters back over the interface. Error messages must be
accessed by using the
*ERR?
query. This
is
the default state
of
the echo mode.
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