5 Remote Control
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5-3
5.2 General Information concerning Remote Control
All functions which can be manually controlled via the keyboard can also be remotely
controlled, except for the device address assignment which can only be set via the
keyboard.
As soon as the instrument has received the first command via the interface, the
keyboard is disabled for manual control of the instrument functions. Manual control
via the keyboard is thereafter possible again after pressing the
LOCAL
-B
UTTON
.
In remote control mode the designator “Rem" is lit in the right window of the main
display.
The instrument understands up to 30 characters in a command. All characters are
ASCII characters. Several commands can be combined in and executed from a single
string of characters sent as one message (e.g. "VDR5A1"), but some commands must
be sent at the end of a string, as ‘NVxxxxxxxxx’, ‘Cnx’, ‘Slx’, ‘D1...’ and the ‘?-
commands’.
The specific commands for controlling data transmission via the interface are
contained in the manual for the utilized IEEE bus interface and some are specific to
the programing language used.
Any space characters (SPACE, ASCII code 20H) contained in the character string
sent by the computer are ignored.
The instrument can receive commands (operation as LISTENER) and it can also send
device messages concerning its status (operation as TALKER). In this status the
indication "ADR" appears on the very right in the display.
The time when the instrument transmits messages can be defined by the computer.
One possibility is for the computer to address the instrument as TALKER, and then
read-out the device message. The second possibility is to operate the instrument in
SRQ (service request) mode. It then requests service from the computer when a status
change has taken place. Switchover to SRQ mode can be made with a command. The
basic status of the instrument after power-up is without SRQ
5.3 Special Features for the RS232 Interface
The DMM 5017 is directly sending measurement values when opening the RS232
interface. If this is not wanted, the command ‘CN0’ can be send from the PC. Then
the instrument sends only a measurement value, if ‘RD?’ comes from the PC.
