SENA HD132x Series User Manual
Page 55
HD132x Series User Manual
55
Appendix. RS232 Cable Connection
Signals of general RS232 9 pin connector:
Pin 1
Received Line Signal Detector (Data Carrier Detect)
DCD
Pin 2
Received Data
RxD
Pin 3
Transmit Data
TxD
Pin 4
Data Terminal Ready
DTR
Pin 5
Signal Ground
GND
Pin 6
Data Set Ready
DSR
Pin 7
Request To Send
RTS
Pin 8
Clear To Send
CTS
Pin 9
Ring Indicator
RI
Table A. Signals of general RS232 9 Pin Connector
HD1320 and 1320E support RxD, TxD, RTS and CTS pins. If DTR and DSR are required for the flow
control, you can disconnect pins 1(DCD), 4(DTR), 6(DSR) of the RS232 connector as shown in Figure
6.1 to allow flow control communication with only RTS and CTS.
In case of HD1321, 5V TTL signal is provided for RS232 communication, and it supports RXD, TXD,
RTS, CTS, DTR and DRS signals.