Communications Parameters

Communications Parameters
ECO SENSORS, INC.
TECH NOTE SM-4-100
5-07
[email protected]
SM-4 CONNECTIONS AND COMMUNICATIONS PARAMETERS
Cable
Terminal Block TB-1
“Sensor Cable “
Red
White
Black
Power
Signal
Ground
2.5 mm jack or TB-2
Red: +5V (if OS-4 is used, connects with OS-4 5 V bus)
White or Yellow: RS232 TXD (output to PC)
Black: GND
Serial Port pinout:
White or Yellow TXD to Pin 2 of DB9 Connector
Black (GND) to Pin 5 of DB9 Connector
8-24 VDC (center + on jack)
Communications Parameters
The output of the SM4 is a RS232 serial string, output at one second intervals. The
communications parameters are as follows:
Bits per second: 9600
Data Bits: 8
Parity: None
Stop Bits: 1
Flow Control: None
Output Format
Comma delimited stream:
Ozone (PPB), Temperature (deg C), Humidity
SM-4 data bottom line above: .032 ppm, 26 deg C, 34% relative humidity
2 THE SENSOR MODULE
SM-4 CONNECTIONS AND REPLACING
1-
.
Locate SM-4 sensor module and
put on workbench.
Sensor mounting centers are
23 mm (2 7/8")
IMPORTANT!!
2 - Disconnect power cable at OS-4
or SM-4 (wherever it is connected).
3 - Remove back cover.
4 - Examine SM-4 board.
5 - Check for tight connections
at the terminal blocks.
nn+8-24V Gnd
Signal
TT
TB-1
Red
Black White
Terminal block (TB-2) and
power jack for powering
at sensor module end
instead of OS-4
6 - Carefully replace SM-X sensor module. Reassemble SM-4 module. Connect power.
SM-4 main board
SM-X replaceable sensor module
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