Parani-SD100 User Manual – 3. Connections
13
RS232C Interface
Ì
DTE/DCE
If the full EIA232 standard is implemented as defined, the equipment at the far end of the connection is named the DTE
device (Data Terminal Equipment, usually a computer or terminal), has a male DB9 connector. Equipment at the near
end of the connection (the telephone line interface) is named the DCE device (Data Circuit-terminating Equipment,
usually a modem), has a female DB9 connector. The cable linking DTE and DCE devices is a parallel straight-through
cable with no cross-overs or self-connects in the connector hoods. If all devices exactly followed this standard, all
cables would be identical, and there would be no chance that an incorrectly wired cable could be used.
Ì
DB9 Female
Parani-SD100 is a DCE device compatible with RS232 standard, having DB9 female interface.
Pin #
Signal
Direction
Description
1 CD
Output
Bluetooth Connect Status
2 TxD
Output
Transmitted Data
3 RxD
Input
Received Data
4 DSR
Input
DTE Ready
5 GND
- Signal Ground
6 DTR
Output
DCE Ready
7 CTS
Input
Clear to Send
8 RTS
Output
Request to Send
9 Vcc
Input
5V ~ 12v
