FLOYD User Manual rev 1.09
www.diamondsystems.com
Page
27
Serial Port and GPIO Connectors: J1, J9
The carrier board is equipped with two serial ports from the Jetson module and 8 GPIO lines derived from a
TCA9538 GPIO expander chip. In the standard configuration, the first serial port terminates on a DB9
connector J1 and the second serial port and the 8 GPIO lines terminates on a 2x10 pin header J9, and. As
a special order, the GPIO lines can be rerouted to the DB9 connector in place of the first serial port.
Model FLD-BB01 supports RS-232, RS-422, and RS-485 protocols on both serial ports. Model FLD-BB02
supports only RS-232 on port 1 and RS-232 and RS-485 protocol on port 2. The protocol selection is made
with jumper block JP2.
Connector J1 – Serial Port 1 (or GPIO)
Pin No.
RS232
RS422
RS485
GPIO
1 –
–
– GPIO
0
2 RXD
RX+ –
GPIO
1
3 TXD
TX+
TX+/RX+
GPIO
2
4 –
–
–
GPIO
3
5
Ground Ground Ground Ground
6 –
–
–
GPIO
4
7 RTS
TX-
TX-/RX-
GPIO
5
8 CTS
RX- –
GPIO
6
9 –
–
–
GPIO
7
Connector Type:
DB9M Connector
Connector Part Number:
A-DS 09 A/KG-T2S
Mating Cable:
Standard serial port cable with DB9 female connector
Pin header J9 contains the second serial port, the GPIO lines, Ground, and a convenience 3.3V power
supply connection via a polyswitch that limits the current to 100mA to prevent damage from overcurrent or
a short circuit.
Connector J9: GPIO & Serial Port 2
RS-485 RS-422 RS-232
RS-232 RS-422 RS-485
GPIO 0
GPIO 0
GPIO 0
1
2
GPIO 1
GPIO 1
GPIO 1
GPIO 2
GPIO 2
GPIO 2
3
4
GPIO 3
GPIO 3
GPIO 3
GPIO 4
GPIO 4
GPIO 4
5
6
GPIO 5
GPIO 5
GPIO 5
GPIO 6
GPIO 6
GPIO 6
7
8
GPIO 7
GPIO 7
GPIO 7
GND GND GND
9
10
3.3V 3.3V 3.3V
- - -
11
12
- - -
- RX+ RX
13
14
RTS TX- TX/RX-
TX/RX+ TX+ TX
15
16
CTS RX- -
- -
17
18
- - -
GND GND GND
19
20
- - -
Connector Type:
2x10, 2 mm Header
Connector Part Number:
220-97-36GB01
DSC Mating Cable Part Number:
C-DB9M-2
