HBM WE2107 - WE2107 Individual Command Descriptions; WE2107 Serial Interface Commands

WE2107 - Communication commands
20
I1820-1.3 enHBM
3 Individual command descriptions
3.1 Interface commands (asynchronous, serial)
To establish communication between the WE and the computer, the interface has to be confi
gured. The following commands are available in the WE to set up the interface and to select
the transfer format:
D Communication address for bus mode ADR
D Baud rate setting BDR
D Output format for measurement data (ASCII / binary) COF
D Select command for a bus user via the communication address (Select) S...
Characteristic data of the serial interface:
Start bit: 1
Word length:8 bits
Parity: none / even
Stop bit: 1
Baud rate: 1200 … 38400 baud
The asynchronous interface of the WE is a serial interface, i.e. there is serial transfer of data,
bit by bit and asynchronously. Asynchronously means that transmission works without a
clock signal.
A start bit is set in front of each data byte. This is followed by the bits of the word (D0...D7), a
parity bit for transfer checking and a stop bit.
Start Parity Stop
1 bit Word length = 8 data bits 1 bit 1 bit
1 character
Fig. 1: Composition of a character