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BUS_Serial Module
4x UART Expansion Module for System Bus Port

Converts System Bus to 4x TTL serial ports
Supports 5-wire serial ports
Size: 61 × 34 mm
Board Support: SBC-SAM9G45

This module is designed to plug into the System Bus connectors (J34 & J35) of the SBC-SAM9G45 development board, giving you four additional serial ports onto which you can connect TTL-RS232 modules or whatever other 3.3V serial device you care to wire up to it.

Input interface

Two 2×10-pin female headers, 2.54mm pitch.

 Connector: J3(2 x 10 Pin 2.54mm header)

Pin Signal Description Pin Signal Description
1 GND GND 2 A0 Address Bus
3 A1 Address Bus 4 AA2 Address Bus
5 A3 Address Bus 6 NC -
7 A5 Address Bus 8 NC -
9 INTA Interrupt A 10 GND GND
11 INTB Interrupt B 12 INTC Interrupt C
13 INTD Interrupt D 14 NRST Reset
15 NRD Processor Read Command 16 NV  
17 NWE Processor Write Command 18 NCS_EXT Chip select
19 GND GND 20 NC  

Connector: J2(2 x 10 Pin 2.54mm header)

Pin Signal Description Pin Signal Description
1 VDD33 Power 3.3V 2 VDD33 Power 3.3V
3 D0 Data Bus 4 D1 Data Bus
5 D2 Data Bus 6 D3 Data Bus
7 D4 Data Bus 8 D5 Data Bus
9 D6 Data Bus 10 D7 Data Bus
11 D8 Data Bus 12 D9 Data Bus
13 D10 Data Bus 14 D11 Data Bus
15 D12 Data Bus 16 D13 Data Bus
17 D14 Data Bus 18 D15 Data Bus
19 GND GND 20 GND GND

Output interface

Four 2×5-pin headers, 2.54mm (0.1") pitch.

Pin J3 J4 J5 J6 Description
1 NC NC NC NC NC
3 RXD6 RXD5 RXD3 RXD4 UART serial data in
5 TXD6 TXD5 TXD3 TXD4 UART serial data out
7 NC NC NC NC NC
9 GND GND GND GND GND
11 NC NC NC NC NC
13 RTS6 RTS5 RTS3 RTS4 UART request to send
15 CTS6 CTS5 CTS3 CTS4 UART clear to send
17 NC NC NC NC NC
19 VDD33 VDD33 VDD33 VDD33 VDD 3.3V

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1 BUS-Serial  $30USD

 


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