FSE Instrument Interfaces
1065.6016.12 8.7 E-15
DSR (Data Set Ready),
Input, active LOW,
Indicates that the remote station is ready to receive data.
RTS (Request To Send),
Output, active LOW.
Indicates that the local terminal wants to transmit data.
CTS (Clear To Send),
Input, active LOW.
Used to tell the local terminal that the remote station is ready to receive data.
RI (Ring Indicator),
Not used in FSE.
Interface Functions
For interface control, several strings are defined and control characters are reserved which are based
upon IEC-\IEEE bus control.
Table 8-4 Control strings or control characters of the RS-232 interface
Control string or character Interface function
"@REM" Switch over to remote
"@LOC" Switch over to local
<Ctrl Q> 11 Hex Enables character output
<Ctrl S> 13 Hex Inhibits character output
0D Hex, 0A Hex Terminator <CR>, <LF>
Transmission Parameters
To ensure error-free data transmission, the parameters of the instrument and the controller must have
the same settings. The parameters are defined in the SETUP-GENERAL SETUP menu.
Transmission rate the following transmission rates can be set in the analyzer:
(baud rate) 110, 300, 600, 1200, 2400, 4800, 9600, 19200.
Data bits Data transmission is in 7- or 8-bit ASCII code. The first bit
transmitted is the LSB (least significant bit).
Start bit Each data byte starts with a start bit. The falling edge of the start
bit indicates the beginning of the data byte.
Parity bit In order to detect errors, a parity bit may be transmitted. No
parity, even parity or odd parity may be selected. In addition, the
parity bit can be set to logic ’0’ or to logic ’1’.
Stop bits The transmission of a data byte is terminated by 1, 1,5 or 2 stop bits.
Example:
Transmission of character ’A’ (41 hex) in 7-bit ASCII code,
with even parity and 2 stop bits:
01 02 03 04 05 06 07 08 09 10 11
Bit 01 Bit 02...08 Bit 09 Bit 10...11
Start bit Data bits Parity bit Stop bits
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