SME RS-232-C Interface
1038.6002.02 6A.5 E-12
Transmission parameters
To ensure an error-free and correct data transmission, the parameters of the instrument and the
controller should have the same settings. The parameters are set in menu UTILITIES-SYSTEM-RS232.
Transmission rate The following baud rates can be set in the instrument:
(baud rate) 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200.
Data bits Data transmission is in 8-bit ASCII code. The first bit transmitted
is the LSB (Least Significant Bit).
Start bit Each data byte begins with a start bit. The falling edge of the start
bit indicates the beginning of the data byte.
Parity bit A parity bit is not used.
Stop bit The transmission of a data byte is terminated by a stop bit.
Example:
Transmission of character A (41 hex) in the 8-bit ASCII code.
01 02 03 04 05 06 07 08 09 10
Bit 01 = Start bit Bit 02...09 = Data bits Bit 10 = Stop bit
Bitduration= 1/baud rate
Interface functions
For interface control, some control characters defined from 0 to 20 hex of the ASCII code can be
transmitted via the interface (see Table A-4).
Table A- 4 Interface functions (RS-232-C)
Control character Interface function
<Ctrl Q> 11 hex Enables character output (XON)
<Ctrl S> 13 hex Inhibits character output (XOFF)
Break (at least 1 character only log 0) Reset instrument
0Dhex, 0Ahex Terminator <CR>, <LF>
Switchover between local/remote
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