User guide

WA_DEV_GL6100_PTS_001 Rev 002 May 24, 2010 41
GL61x0 Product Technical
Specification and User Guide
Interfaces and Peripherals
Pin #
Signal*
I/O**
Reset State
Description
2
RS232- RTS
I
Z
Request To Send
3
RS232-RXD
O
1
Receive serial data
4
RS232-TXD
I
Z
Transmit serial data
5
RS232-DTR
I
Z
Data Terminal Ready
* According to the PC (DTE) view.
** According to the GL6100 (DCE) view, from which the direction of the signal is defined.
The RS-232 interface has been designed to allow flexibility in the use of the serial interface signals.
Note that the use of TX and RX signals are mandatory; while the use of CTS, RTS and DTR signals
are recommended.
Tip: The GL6100 is designed to operate using all serial interface signals and it is recommended to use
RS232-RTS and RS232-CTS for hardware flow control in order to avoid data corruption during
transmission. Otherwise proper configurations of the pins are required.
The GL6100 also implements the Serial Port Auto Shut Down feature with the DTR signal. It is
recommended to use the RS232-DTR signal to benefit from the current consumption improvement
performed by this feature.
6.2.1.2.1. RS-232 Implementation
The following subsections describe how the RS-232 serial link can be implemented to suit different
designs.
6.2.1.2.1.1. 5-wire Serial Interface RS-232 Implementation
The signals used in this implementation are as follows:
 RS232-TXD
 RS232-RXD
 RS232-CTS
 RS232-RTS
 RS232-DTR
Note: The RS232-DTR signal must be managed following the V24 protocol signaling if the Sleep Idle Mode
and Serial Port Auto Shut Down feature are to be used.