Transmission Parameters; Interface Functions; Handshake - Fluke Norma 4000 User Manual

Remote Control
Users Guide

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
General Setup screen of the instrument.
Transmission rate
(baud rate)
Data bits
Start bit
Parity bit
Stop bit
Bit 01 = start bit
Bit duration = 1/baud rate
Example
Transmission of character A (41 hex) in 8-bit ASCII code

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.
Control character
<Ctrl Q> 11 hex
<Ctrl S> 13 hex
Break (at least 1 character
logic 0)
0Ahex

Handshake

Software Handshake
The software handshake with the XON/XOFF protocol controls data transmission. If the
receiver (instrument) wishes to inhibit the input of data, it sends XOFF to the transmitter.
The transmitter then interrupts data output until it receives XON from the receiver. The
same function is also provided at the transmitter end (controller).
The software handshake is not suitable for the transmission of binary
data,a hardware handshake is preferred.
3-8
Eight different baud rates can be set on the instrument
1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Data transmission is in 8-bit or 7-bit ASCII code. The LSB (least
significant bit) is transmitted as the first 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.
Odd, Even, Zero, One, None
The transmission of a data byte is terminated by a stop bit.
01 02 03
Bits 02 to 09 = data bits
Table 3-4. Control Characters for RS-232-C Interface

Interface functions

Enable character output (XON).
Stop character output (XOFF).
Clear input buffer of the instrument. All pending queries will be aborted. It is
similar to IFC on GPIB interface.
Terminator <LF>. The instrument goes to remote state on receipt of this
character together with a valid command.
05 06
04
Bit 10 = stop bit
Note
07 08 09 10