Diesse VES-MATIC EASY, Service Manual

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Service Manual
[TotPagAnnex: 14]
A-3 Rev.1.1 of 15/04/2017
2. GENERAL SPECIFICATIONS FOR CONNECTION TO A HOST COMPUTER
It is possible to connect the V
ES
M
ATIC
E
ASY
to a Host Computer via the USB interface, installed on the
rear of the instrument.
For connection, use the standard USB cable [‘USB 1.1 A-B M/M CABLE’ type] supplied with the system.
The system is also supplied with a CD-ROM that contains USB drivers for Windows XP and the
instructions for installation [Order Code: 22100210] to configure the PC’s serial USB port.
WARNING:
In case of any communication problem with the host, check that the COM ID is the same that
has been assigned upon installation (sometimes new addresses are assigned to PC ports
during subsequent hardware installations).
For the configuration of the hardware of the ID address of the instrument refer to paragraph 3.1.8.
3. SPECIFICATIONS OF THE ASYNCHRONOUS SERIAL COMMUNICATION
PROTOCOL
A bi-
directional serial communication protocol called “NewProtocol” is installed on the V
ES
M
ATIC
EASY
instrument (described in the following section).
The speed of the transmission is 19200 bit/s; the data format is of the type with 8 data bits, 1 stop bit and
no parity bit.
Representation of the transit bytes on the serial:
STX BLK BLK LEN LEN ADD ADD COM COM D1 ... Dn ETX CHK CHK
Each box represents 1 byte that transits on the serial port, while the pair of bytes will be packed in the
memory, meaning that they will return to being 1 byte.
STX : ASCII '>' 0x3E character
BLK
: Block number, always = ‘00’ unless for multi-block transferrals (see command 03)