6
IE-SNC-T03(4)10+T5410-06
Info mode
If in doubt of setting of installed device, verification of its address is enabled even without
using computer. Power should be connected. Devices with RS232 interface have address always set
to one.
Unscrew device cover and shortly press button next to connection terminals (jumper should
be opened). Actual adjusted address of the device is displayed on LCD display at decimal base,
for HWg-Poseidon’s communication protocol there is shown number corresponding with ASCII
address code. Next press of button exits info mode and actual measured values are displayed.
Note: No measurement and communication is possible during info mode. If device stays in info
mode for longer than 15 s, device automatically returns to measuring cycle.
Setting of pressure correction for altitude
For device T5410 only! If there is necessary to read value of atmospheric pressure corrected
with respect to altitude, it is possible to set corresponding pressure offset for this altitude. It is
possible to do it with Users software. This value is then automatically added to measured pressure
value. The resultant value of pressure with added correction for altitude must be between 300 hPa
and 1350 hPa (from 4.351 PSI to 19.580 PSI). Outside this range device sends value of Error 2!
Description of communication protocols
Detailed description of each communication protocols including examples of
communication is available in individual document “
Description of communication protocols of
Txxxx series”
Note: After switching ON the power of the device it can last up to 2 s before the device starts to
communicate and measure!
Modbus RTU
Control units communicate on master-slave principle in half-duplex operation. Only master
can send request and only addressed device responds. During sending of request no other slave
station should respond. During communication, data transfer proceeds in binary format. Each Byte
is sent as eight bit data word in format: 1 start bit, data word 8 bit (LSB first), 2 stop bits
1
, without
parity. Device supports communication speed from 110Bd to 115200Bd.
Sent request and response have syntax: ADDRESS OF DEVICE – FUNCTION – Modbus
CRC
Supported functions
03 (0x03)
: Reading of 16-bit registers (Read Holding Registers)
04 (0x04)
: Reading of 16-bit input gates (Read Input Registers)
16 (0x10)
: Setting of more 16-bit registers (Write Multiple Registers)
Jumper and button
Jumper and button are located next to connection terminals. If communication protocol Modbus
is selected the function of jumper and button is as follows:
•
Jumper opened – device memory is protected from writing, from device side it is only
enabled to read measured value, writing to memory is disabled (no change of device
address, communication speed and LCD setting is enabled).
•
Jumper closed – writing to device memory is enabled by means of User’s software.
1
Device sends two stop bits, for receive one stop bit is enough.