USBIO24 ELEXOL, USBIO24 Datasheet - Page 9

• Manufacturer Part Number: USBIO24
• Description: DIGITAL I/O MODULE, USB TO 24 I/O
• Manufacturer: ELEXOL
• Type: USB I/O Moduler

Specifications of USBIO24

• Development Tool Type: Digital I/O Module
• Tool / Board Application: Digital Signal Transfer
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Temperature Sensor Interface using DS18B20
Convert Start
Read Temperature
Notes on the DS18B20
Status Bytes
The DS18B20 requires a resistor between 1K and 4.7K between the data line and the +5V rail. A
DS18S20 may also be used if the higher resolution of the DS18B20 is not required.
NOTE: This interface will not work with the 50MHz upgrade.
Reprogramming and Customising the firmware
In order to reprogram the original or any customised firmware into the USB I/O 24 you will require
a SX Key programmer. These programmers are available from Parallax. For further information on
these programmers visit
The firmware for the USB I/O 24 is available on request. Please contact
50MHz Upgrades
Upgrades are available to run the SX48 at 50MHz clock speed instead of using the internal 4MHz
clock.
Accessory Boards
Accessory boards are available for this product. Please check the Elexol website for further
information.
Elexol Pty Ltd
COMMAND
COMMAND
‘K’
‘J’
G
C
N
E
S
Command execute normally
A CRC error occurred while reading the data
No sensor found
Bad pin number (only pins 0 to 23 are valid)
Bus Shorted (or pull up resistor missing)
1 Byte specifying
which pin 0 to 23
1 Byte specifying
which pin 0 to 23
Version 1.1
DATA
DATA
http://www.parallax.com/sx/programming_kits.asp
1 Byte Status of Command
3 Bytes
Byte 1 – Status (see below)
Byte 2 – MSB of Temperature
Byte 3 – LSB of Temperature
Page 9
USB I/O 24 R Datasheet
REPLY
REPLY
http://www.elexol.com
[e-mail]
Read Temperature
Start Conversion
FUNCTION
FUNCTION