The MNT-101 series preprogrammed microcontrollers were designed to perform high-speed serial-to-parallel conversion from a standard RS-232 data source. Baud rate is determined by the speed of the ceramic resonator or crystal attached to the microcontroller. Up to 7 MNT-101 can be attached to a single RS-232 serial port providing a total 56 individually addressable output bits. (You can upgrade to a maximum of 1024 com ports giving you: 1024 x 56 = 57344 devices to control). The NAME jumpers N1, N2, and N3 determine its address on the serial port. Addresses: (Names) The Name Select Pins are used to assign a name to the chip. The chip will only obey an ASCII comand if the command is preceded by it's selected name. When the name is selected to be ALL, then the chip will ignore all naming protocols and it will output the on or off command of any byte that is input (ASCII) Commands: If a proper name is selected with the name select pins then the MNT-101 will be able to obey three commands. ( indicates a carraige return character) Turn a pin on: N EXAMPLE command string: 2N3 (device named "2" turns on pin 3) Turn a pin off: F example command string: 5F2 (device named "5" turns off pin 2 Output a Byte: P Example command string: 1P (device named "1" outputs the value of the byte) Truth Table: N1 N2 N3 Name 1 1 1 All (all chips enabled) 1 1 0 6 (device Named SIX ) 1 0 1 5 (device Named FIVE) 1 0 0 4 (device Named FOUR) 0 1 1 3 (device Named THREE) 0 1 0 2 (device Named TWO) 0 0 1 1 (device Named ONE) 0 0 0 0 (device Named Zero) When all name jumpers are installed, the MNT-101 performs a raw serial-to-parallel conversion. In turn the output bit could be connected to a switching relay, Solid state relay, solenoid, motor or triac to power on or off any electronic or electrical device. The system uses two wires from the Com port and can run upto half a KM. Since I have recieved many request for the circuit diagram, I am enclosing this. To view it, you need a program call ACDsee. You can get this from : http://www.download.com If you need further info, you may request for a general catalog which contains our whole line of chips to solve common automation problems. Nashtech #05-16 International Plaza 10 , Anson Road Singapore 079903 Tel: (65) 4426897 Fax: (65) 2439309 Email: technova@pacific.net.sg Naresh Melwani Technical Manager Nashtech Content-Type: image/x-MS-bmp; name="mnt101B.bmp" Content-Disposition: inline; filename="mnt101B.bmp" Attachment converted: wonderland:mnt101B.bmp (????/----) (00006F2D)