Serial Connector
The CFSound-IV can function as either a RS-232 DTE (Data Terminal Equipment) or RS-232 DCE
(Data Communications Equipment) device. There is a jumper block site on the board labeled JB1 that can be
used to reverse the pins of the signals pairs TxD, RxD and RTS, CTS on the SERIAL connector to
accomplish this change.
DB-9P Signals
Connection to the SERIAL connector requires a female DB-9S mating connector. The following signals
appear on the male SERIAL DB-9P connector:
JB1 Serial Configuration Jumpers
JB
1
JB
1
JB
1
JB
1
DEFAULT in copper traces
R
S-
4
8
5
D
TE
R
S-
2
3
2
D
C
E
The board is configured as RS-232 DCE to allow use of a 1 to 1 cable between the CFSound and a PC.
This configuration is established by copper jumpers on the bottom of the board between the JB1 pins.
SERIAL DB-9P Connector
PIN
DCE
Signal
JB1 as DCE
Direction
DTE
Signal
JB1 as DTE
Direction
1
RS-485 B- I/O
RS-485 B- I/O
2
RS-232 TxD OUT
RS-232 RxD IN
3
RS-232 RxD IN
RS-232 TxD OUT
4
5
GND PWR
GND PWR
6
RS-485 A+ I/O
RS-485 A+ I/O
7
RS-232 CTS IN
RS-232 RTS OUT
8
RS-232 RTS OUT
RS-232 CTS IN
9
+12-15VDC PWR
+12-15VDC PWR
