| ??? 11/11/04 07:56 Read: times |
#81019 - Yes and No Responding to: ???'s previous message |
Shahzad said:
I have two AT89c55 chips and i want them to communicate with each other with their RS232 pins. Note that the 8051 (any 8051) does not have RS232 pins; it has serial IO pins. For an interface to be described as "RS232" it must use the bipolar RS232 signal levels (and meet all the other requirements of the RS232 Spec, of course). Shahzad said:
Should i connect the TX pin with RX pin, and RX pin with TX pin of each processor directly or do i need some interfaces between them. There is nothing special about the serial data pins - they are just like any other port pin. Therefore the same rules apply as to any other connection to a port pin. If they're both on the same PCB, a direct (non-RS232) connection would be fine. If they're on different PCBs within an equipment, a direct (non-RS232) connection might be OK. If there's a cable going between separate equipments, you certainly should use a transceiver. Note that a transceiver also gives you ESD protection, etc |
| Topic | Author | Date |
| RS232 between two 8052's | 01/01/70 00:00 | |
| RE: RS232 between two 8052\\\'s | 01/01/70 00:00 | |
| RE: RS232 between two 8052\\\'s | 01/01/70 00:00 | |
| Not RS232 | 01/01/70 00:00 | |
| more advise needed | 01/01/70 00:00 | |
| NOT RS232!! | 01/01/70 00:00 | |
RE: NOT RS232!! | 01/01/70 00:00 | |
| Yes and No | 01/01/70 00:00 | |
| RE: RS232 between two 8052's | 01/01/70 00:00 |