Instruction Manual

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www.vtsgroup.com Page 11 of 16 ver. 2.0 (11.2021)
Command table:
Command no.
Function
Parameters
1
Set device address
1-247 (1 – default value)
2
Set the baud rate
24 – 2400 bit/s
48 – 4800 bit/s
96 – 9600 bit/s
192 – 19200 bit/s = default value
384 – 38400 bit/s
576 – 57600 bit/s
1152 – 115200 bit/s
3
Set parity bits
0 – NO PARITY, no parity bit (default value)
1 – EVEN PARITY, even parity bit
2 – ODD PARITY, odd parity bit
4
Set stop bits
1 – 1x STOP, 1 stop bit (default value)
2 – 2x STOP, 2 stop bits
6
Device reset
1 – software reset of the device
2 – software reset of sensor module
Notes:
 Reading registers from addresses not listed in this table results in 0x02 exception.
 Specifying an incorrect or out-of-range parameter value results in entering the value
0xEEEE into the command register.
 The device is configured by writing three registers (password / command /
parameter) at the same time using the 0x10 function with the corresponding values
– according to the command table, or by writing single registers (using 0x06 or 0x10
function) with the latter writing of a (valid) password causing the execution of the
command.
 During a single password entry (both with function 0x06 and 0x10) in case of a
password match, the correctness of information in command and parameter
registers is checked and if correct, the command is executed.
4.1.1. DEV_ID_REG (addr=11=0x000B) – read only
Bit no.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
name
DEV[4..0]
HV[1..0]
OPTIONS[4..0]
0
0
T[1..0]
This register is used to store device ID. Meaning of bits:
DEV[4..0] = b11000 – fixed value meaning “air parameter sensors”
HV[1..0] – value 0..3 – hardware version
OPTIONS[4..0] – values 0..31 – device type