Messages SME
1038.6002.02 3.4 E-13
3.3.2 Remote Control via RS-232-Interface
3.3.2.1 Setting the Transmission Parameters
To enable an error-free and correct data transmission, the parameters of the unit and the controller
should have the same setting. To prevent any problems during binary data transmission, the RS-232
interface is set for 8 data bits, no parity and 1 stop bit. This data format corresponds to the current IEEE
P1174 standard. Parameters baud rate and handshake can be manually changed in menu
UTILITIES-SYSTEM-RS-232.
À Call UTILITIES-SYSTEM-GPIB-RS232 menu
À Select desired baudrate and handshake
À Terminate input using the [1x/ENTER] key
3.3.2.2 Indications during Remote Control
The state of the remote control is evident by the words "RS-232 REMOTE" or "LOCAL" on the STATUS
page. The STATUS page is always displayed in the REMOTE state.
3.3.2.3 Return to Manual Operating
Return to manual operation is possible via the front panel.
ÀPress the [LOCAL] key.
Note: Before switchover, command processing must be completed as otherwise
switchover to remote control is effected immediately.
3.4 Messages
The messages transferred via the data lines of the IEC bus (see annex A) can be divided into two
groups:
- interface messages and
- device messages.
3.4.1 Interface Message
Interface messages are transferred on the data lines of the IEC bus, the ATN control line being active.
They are used for communication between controller and instrument and can only be sent by a
controller which has the IEC-bus control. Interface commands can be subdivided into
- universal commands and
- addressed commands.
Universal commands act on all devices connected to the IEC bus without previous addressing,
addressed commands only act on devices previously addressed as listeners. The interface messages
relevant to the instrument are listed in annex A.
Some control characters are defined for the control of the RS-232-interface (see annex A)
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