R&S FSMR, Operating Manual

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Instrument Interfaces R&S FSMR
1166.3363.12 8.8 E-1
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 R&S FSMR .
Input, active LOW.
Used by a modem to indicate that a remote station wants to establish a connection.
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 instrument:
(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