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Communication Protocol; Survey Of Commands - thyracont vd6 Betriebsanleitung

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4.6 Communication Protocol

When the Mini USB port at the back of the VD6 is connected to a PC by a
suitable interface cable (accessory WUSB0002), the instrument can be remote
controlled by the PC via Virtual-Com-Port protocol, e.g. using VacuGraph
Software (accessory VGR).
Communication is carried out according to the Thyracont protocol. The com-
mands are sent as ASCII-code in the following command frame:
Address
Code
Address:
3 Bytes, decimal; address RS232, USB: 001
Code:
1 Byte, command parameter, upper case character for read com-
mand, lower case character for write command
Data:
data field, max. 6 Bytes; can be absent depending on code
cks:
1 Byte, checksum, defined as sum over all Bytes of the fields
address, code and data, modulo 64 plus 64.
CR:
Carriage Return (0Dh, 13d)
Data Formats:
BOOLEAN
STRING:
UNSIGNED INT:
FLOAT:
FLOAT-values are transmitted in hPa (mbar)!
Example: Value "460019" in a float type data field means 4.6x10

4.7 Survey of Commands

By the serial interface of the VD6 the following functions are available:
Command
Type
Measurement Value
Setpoint
Hysteresis
Gas-Correction-Factor
Control start/stop
Keylock
Data
1 Byte
max. 6 Bytes
6 Bytes with leading zeros
6 Bytes, exponential format
4 Bytes mantissa (means mantissa value x 1000)
2 Bytes exponent, offset 20
Code
Data Type
T
STRING
M
FLOAT
S, s
FLOAT
H, h
FLOAT
C, c
UNSIGNED INT
A, a
BOOLEAN
K, k
BOOLEAN
cks
CR
mbar.
-1
Function
read
read
read S, write s
(SP1 and SP2)
read H, write h
(H1 and H2)
read C, write c
read A, write a
read K, write k
man_vd6s2-de-150615
41
TM

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