We are working on communication between AVR and a Crous PTZ.
We can see some details about Crous communication ports on page 15 of its guide :
These details we applied in RS232 communication:
1 - Crous rs232 is connected to rs232 port of PC and communication has been tested with&without MAX232 .
2 - Ground of Crous power is separate , (PC RS232 & Crous RS232 grounds are connected to each other).
3- All voltages applied are 12 V .
4 -Oscilloscope has been used and it shows only a puls is sent to device but does not show any respond from device
What's your opinion ?why there is no respond on rs232 port?Cours device is new , so is it probable its damaged ?