Data output
By default setting, the GSV operates with a communication bit rate of 38400 Baud
3
,
1 Start bit, 8 data bits, no Parity and 1 stop bit (8N1).
There are two types of data frames for the communication of the measuring values:
1. Binary format
2. Text format
The settings of the data formats may be changed with the software GSV Control.
In the normal mode, the GSV transmits its measuring values to the serial interface
permanently. In the binary format the GSV transmits 5 bytes for every single measuring
value (frame size is 5 Bytes):
,
(ASCII: 44d) Status
Hbyte (MSB)
MByte
Lbyte (LSB)
The first byte is used for synchronization.
From Firmware-Version 1.3.06 on, the status-byte contains in bits 3 and 4 information
about the state of the threshold switches SW1 and SW2.
Bit 7
Bit 6
Bit 5
Bit 4
Bit3
Bit 2
Bit 1
Bit 0
Res.
Res.
Res.
SW 1
SW 2
Res.
Res.
Res.
Res.: reserved
SW1, SW2: State of the threshold switches SW1 and SW2
1: threshold switch is on, 0: threshold switch is off
After that there are the three data bytes, starting with the-most significant byte (MSByte),
followed by the Mbyte, until the least significant byte, so that 24 Bits are transmitted. In the
unipolar mode the measuring value zero is equal the data value zero (0x000000). In the
bipolar mode the measuring value zero corresponds to the data value 0x800000 as a
hexadecimal value.
At an amplification of 1 mV/V you will get the following raw data:
Measuring value
(
hexadecimal)
Unipolar
Bipolar
00 00 00
0,0
mV/V
-1,05
mV/V
80 00 00
0,525
mV/V
0,0
mV/V
FF FF FF
1,05
mV/V
1,05
mV/V
If another amplification is used, it is necessary to multiply it with the corresponding factor
of proportionality.
The full range of 1,05 mV/V was chosen to be able to measure measuring values which
are a bit greater than 1,0 mV/V. See also p.55
If desired, you can switch the data output to the
ASCII Format
using the configuration
program
GSV.EXE
or with the Windows-DLL (or with the firmware-command Set Mode,
38d) . The ASCII output corresponds to the values displayed in the LCD and it also can be
shown with a terminal program.
In the default settings the data format of the ASCII frame is:
3
1) The baud rate can be changed , SetBaud Page 38
ME-Meßsysteme GmbH, Neuendorfstr. 18a, D-16761 Hennigsdorf
16
Phone 03302 78620 60, Fax 03302 78620 69,
,
www.me-systeme.de/en
Summary of Contents for GSV-2AS
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