User Guide

GE9

GE9GE9

GE910 Hardware User Guide

10 Hardware User Guide10 Hardware User Guide

10 Hardware User Guide

1vv0300962 Rev.4 2012-06-25

Mod. 0805 2011-07 Rev.2

The signals of the GE910 serial port are:

RS232

Number

Signal GE910

Pad Number

Name Usage

1 DCD - dcd_uart N14 Data Carrier Detect

Output from the GE910 that indicates the

carrier presence

2 RXD - tx_uart M15 Transmit line *see Note Output transmit line of GE910 UART

3 TXD -rx_uart N15 Receive line *see Note Input receive of the GE910 UART

4 DTR - dtr_uart M14 Data Terminal Ready

Input to the GE910 that controls the DTE

READY condition

5 GND P13 Ground ground

6 DSR - dsr_uart P14 Data Set Ready

Output from the GE910 that indicates the

module is ready

7 RTS -rts_uart L14 Request to Send

Input to the GE910 that controls the

Hardware flow control

8 CTS - cts_uart P15 Clear to Send

Output from the GE910 that controls the

Hardware flow control

9 RI - ri_uart R14 Ring Indicator

Output from the GE910 that indicates the

incoming call condition

NOTE:

According to V.24, RX/TX signal names are referred to the application side, therefore on the

GE910 side these signal are on the opposite direction: TXD on the application side will be

connected to the receive line (here named TXD/ rx_uart ) of the GE910 serial port and

viceversa for RX.

NOTE:

For a minimum implementation, only the TXD and RXD lines can be connected, the other lines

can be left open provided a software flow control is implemented.

NOTE:

In order to avoid a back powering effect it is recommended to avoid having any HIGH logic

level signal applied to the digital pins of the GE910 when the module is powered off or during

an ON/OFF transition.