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Chapter 6, COMPUTER OPERATION
6.7.11 Computer Interfaces
RS [n
RSADDR [n]
USBTERM [n]
\N n
6-32
Bit Decimal value
20
1048576
21
2097152
The values of the selected curves at the same sample point are transferred as a group
in the order of the above table, separated by the chosen delimiter character and
terminated with the selected terminator. This continues until all the points have been
transferred.
NOTE: When transferring the Frequency curve, which is saved when bit 15 in the
CBD parameter is asserted, the instrument automatically reads the data for each
stored point in both frequency curves (i.e. the lower and upper 16 bits) and sends it
as a single data point.
[n
]]
Set/read RS232 interface parameters
1
2
n
Baud rate (bits per second)
1
0
75
1
110
2
134.5
3
150
4
300
5
600
6
1200
The lowest five bits in n
following table:
bit number bit negated
0
data = 7 bits
1
no parity bit
2
even parity
3
echo disabled
4
prompt disabled
Set/read RS232 address
The value of n sets the RS232 address in the range 0 to 15. This is relevant only
when using more than one instrument connected via the RS232 "daisy-chain"
method. Each instrument must be set to a unique address.
Set/read USB terminator
The value of n sets the USB terminator according to the following table:
n
Function
0
A null character (ASCII 0)
1
A null character (ASCII 0), followed by a byte representing the value of the
status Byte (table 6-1), followed by a byte representing the value of the Overload
Byte (table 6-1)
Address command
When the model 7124 is daisy-chained with other compatible instruments this
command will change which instrument is addressed. All daisy-chained instruments
receive commands but only the currently addressed instrument will implement or
respond to the commands. The exception is the \N n command. If n matches the
Output and range
Phase
Output (±18000 = ±180°)
2
Sensitivity
setting (3 to 27) + IMODE
2
(0, 1, 2 = 0, 32, 64)
n
1
7 1800
8 2000
9 2400
10 4800
11 9600
12 19200
13 38400
control the other RS232 parameters according to the
2
bit asserted
data = 8 bits
1 parity bit
odd parity
echo enabled
prompt enabled
Baud rate (bits per second)
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