If using USB port, first make sure PC has FTDI driver installed:
You should be able to send commands to the USB-MSP/LCD-90 and receive values back, through the COM port.
You could try this Hyper Terminal_LV2010 v1.1.0 program: Hyper Terminal_LV2010 v1.1.0 program
Set the program's COM port to the COM port the LCD-90 Pro is plugged into or the USB virtual COM port presented by the USB driver (LCD-90 or USB-MSP), and set 9600 Baud, 8 Data Bits, No Parity, 1 Stop Bit, No Flow Control.
Now look in LCD-90 or USB-MSP manual to find which ASCII commands they respond to and what they send back. Use this information accordingly, in your LabView program. For example, to receive current radiation level, send BELL(control g)P and LCD-90 or USB-MSP will send back the floating point number in ASCII format.
(For just the number, send: ESC BELL Z BELL J BELL P without the spaces).
For detailed instructions see: LCD90 Pro, USB-MSP ASCII COMMANDS.pdf
These files might help you write a driver:
If you do not have a LCD-90 Pro or USB-MSP, you need a counter input board or device compatible with Labview, to count the pulses from the RM. The following instructions can be applied to any “counter” board or device, including PCI cards, USB devices, microcontrollers, etc.
The RM will run with a voltage of between 3 and 20VDC. The RM will draw less than 1 ma from your power supply.
There are four wires coming from the RM namely Plus – Minus – Signal -Signal ground.
To connect to counter, connect the Plus lead to your counter or microcontroller power supply plus (anywhere from 3VDC to 20VDC). Connect the Minus and Signal Ground to your counter or microcontroller power supply minus. Connect the Signal lead directly to your counter or microcontroller input pin.
The signal line is held positive by-way-of an internal to RM 4.7K resistor and is pulled to the minus lead with each detection, by-way-of an internal to RM saturating silicon switch, for the duration of the tube’s deadtime, which will be ~50 to ~80 microseconds. Count these pulses. (Note one can connect multiple RMs in parallel to the same input since RMs are open collector and the saturating switch in any one RM can pull to ground the 4.7K resistors in all the RMs).
Below is diagram of RM MOD jack. You could use the supplied telephone wire and strip and solder the four leads or use a telephone surface mount box to gain access to the leads. Surface Mount Box
Return to index page?