| ??? 01/30/03 04:56 Read: times |
#37723 - RE: 1 Sport w/3 8052's network?? Responding to: ???'s previous message |
If you use a MAX232 driver for all three 8051 RS232C interfaces it is possible to parallel the three txd outputs by connecting a switching diode's anode to pin 7 of each of the MAX232's. To the cathode connect a 47k ohm resistor to pin 6 of the MAX232. The output (cathode) is then pulled to the mark (-10 V) condition. This allows several MAX232 drivers to coexist with similarly configured MAX232's. Each slave will require a unique Identification number that is to be polled by the master. This can be provided when you program the flash or EPROM or by perhaps a dip switch installed on your printed circuit board.
Probably the easiest thing to do is use a p89c668 or similar and use the I2C interface protocol. This will save using the MAX232's. |
| Topic | Author | Date |
| 1 Sport w/3 8052's network?? | 01/01/70 00:00 | |
| RE: 1 Sport w/3 8052's network?? | 01/01/70 00:00 | |
| RE: 1 Sport w/3 8052's network?? | 01/01/70 00:00 | |
| RE: 1 Sport w/3 8052's network?? | 01/01/70 00:00 | |
| No need for RS232? | 01/01/70 00:00 | |
| RE: No need for RS232? | 01/01/70 00:00 | |
| Serial Mode 3 or 9 bit mode | 01/01/70 00:00 | |
RE: Serial Mode 3 or 9 bit mode | 01/01/70 00:00 |