Chapter 5, FRONT PANEL OPERATION
5-31
Figure 5-22, RS232 Settings Menu
This menu has seven controls affecting the RS232 computer interface, as follows:-
BAUD RATE
This control sets the baud rate (bits per second) to one of the following values:-
75 1800
110 2000
134.5 2400
150 4800
300 9600
600 19200
1200 38400
DATA BITS
This control sets the data transmission to one of four formats:-
Data Bits Description
7 + 1 parity 7 data bits + 1 parity bit
8 + 1 parity 8 data bits + 1 parity bit
8 + no parity 8 data bits + 0 parity bit
ADDRESS
When more than one compatible instrument is connected in "daisy-chain" fashion by
coupling the AUX RS232 connector on the rear panel of the instrument to the RS232
port on the next, then this control is used to define the instrument's RS232 address.
All daisy-chained instruments receive commands but only the instrument currently
being addressed will implement or respond to them, except of course the command
that changes the instrument to be addressed.
ECHO
This control, when switched on, causes the model 7270 to echo each character
received over the RS232 interface back to the controlling computer. The computer
should wait until the echoed character is returned before it sends the next character.
When switched off, character echo is suppressed.
NOTE: Character echo should always be switched on, except when controlling the
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