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BPS-DAT-(PCB-CB-485)-0001 Rev 1.00 Datasheet.doc

1x10 Header (J10), UART Logic Levels

The 1x10 header is usually installed on the bottom

of the PCB to allow the adapter to be inserted in a

breadboard or development board, or soldered into

a prototyping board.

The ComBoard 1x10 pinout is as follows:

Pin

Name

Description

Signal Direction

1

GND

Ground

2

Rx

Receive Data

Input (to MCU)

3

Tx

Transmit Data

Output (from MCU)

4

+5V (or +3.3V)

Power

Power to ComBoard

5

Ring

Ring

Input (to MCU)

6

CTS

Clear To Send

Input (to MCU)

7

RTS

Request To Send, Used for

RS-485 Driver Enable

Output (from MCU)

8

DSR

Data Set Ready

Input (to MCU)

9

DCD

Data Carrier Detect

Input (to MCU)

10

DTR

Data Terminal Ready

Output (from MCU)

The DTE names are used for logic-level signals (Tx is an output).

All signal levels on this header are CMOS logic levels. MCU = the microcontroller.

Pins 5,6,8,9,10 Not Used on CB-485 modules.

The ComBoard 1x10 pin out provides all 9 pins required for full serial port handshaking plus a power

pin. Some modules may only use some of the pins, such as Tx and Rx for 2-wire serial, or Tx, Rx, RTS

and CTS for 4-wire serial with flow control.

The power supplied on pin 4 is +5V or +3.3V depending on the development board and jumper options.

The CB485, CB-232F and CB-232M modules use the same 1x10 connector signals so that they can be

plugged in interchangeably on development boards. Note that DTE signals names and directions are

used on the 1x10 connector regardless of whether the module and DB9 connector is DTE (DB9M) or

DCE (DB9F).