User guide

midon design
TEMP08 User Guide Version 4.0x Page 5 of 25
• On-board DS2438 voltage and temperature sensor
• Jumper-less provisioning - all configuration settings are stored in non-volatile memory
• Up to 60 1-Wire are sensors supported
• Simple instruction set with a Help (HLP) prompt for recalling command names
• Easy to delete sensors, if they are no longer required, using the DEL command
• 1-Wire bus errors, such as shorted wires, are flagged when they occur
• Support for software serial flow control (Control-S, Control-Q) to permit inspection of long
lists without scrolling beyond your terminal’s page length
• Continuous poll for presence of sensors. TEMP08 will notify you when any sensor is
connected or disconnected, providing that they have been previously recognized by
TEMP08 via the INI command. This may be useful for locating intermittent 1-Wire bus
problems or identifying which sensor is which.
• Manual Poll of sensor readings. While TEMP08 is normally used for regular (from 1 to 99
minute intervals) polling of sensor readings, it may also be used manually to take sensor
readings on command from the serial interface.
3. Installation
To complete this project, you will need to connect a 12 to 16 Volt (AC or DC)
transformer to the terminal J1 (see Figure 3 or 4 for the location of J1). If you
intend to power 1WIO relay units from the 12V output of TEMP08, the
transformer needs to supply at least 350mA (250mA for 1WIO and 100mA for
TEMP08) per 1WIO relay unit, up to a maximum of 800mA, or 2 1WIO relay
units. Beyond that, supplemental powering will need to be provided for the off-
board units. Otherwise, any 12 to 20 Volt adapters capable of at least 100mA
will do.
ALTERNATIVELY, to power this project, you could to connect a 5Volt DC power
supply via a standard USB A to B cable to the connector J2 (see Figure 3 or 4 for
the location of J2). Make sure that the power supply can provide at least 50mA
of current. Do not use both J2 and J1 powering – only one can be used. If you
choose to use 5VDC from J2, then the J3 12Volt power output will not be
available.
If you are using a sensor network of 1-Wire devices, connect them now to
connector J3.
If you are using DS18S20 or DS18B20 temperature sensors, only 2 pins of each
sensor needs to be connected, however a connection is required between the
VDD and GND pins of the sensor if you are using parasitic powering. If +5VDC