R&S®SML / R&S®SMV03 Interfaces
1090.3123.12 E-6 5.29
Transmission Parameters
To ensure error-free and correct data transmission, the transmission parameters on the instrument and
the controller must have the same settings. The settings are made in the Utilities - System-RS232
menu.
Transmission rate Eight different baud rates can be set on the instrument:
(baud rate) 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Data bits Data transmission is in 8-bit ASCII code. The LSB (least significant
bit) is transmitted as the first bit.
Start bit The transmission of a data byte is initiated with a start bit. The
falling edge of the start bit indicates the beginning of the data byte.
Parity bit No parity bit is used.
Stop bit The transmission of a data byte is terminated by a stop bit.
Example:
Transmission of character A (41 hex) in 8-bit ASCII code:
01 02 03 04 05 06 07 08 09 10
Bit 01 = start bit Bits 02 to 09 = data bits Bit 10 = stop bit
Bit duration = 1/baud rate
Interface Functions
For interface control, a number of control characters defined from 0 to 20 hex of the ASCII code can be
transmitted via the interface.
Table 5-8 Control characters for RS-232-C interface
Control character Function
<Ctrl Q> 11 hex Enable character output (XON)
<Ctrl S> 13 hex Stop character output (XOFF)
Break (at least 1 character logic 0) Reset instrument
0Dhex, 0Ahex Terminator <CR><LF>
Local/remote switchover
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