Sierra Wireless AirLink FX100, Руководство пользователя

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4112221 Rev 7.2 June 19, 2013 35
User Guide Interfaces
5.1.2.1. RS232 Serial Link Connection
Also known as the main serial link, the RS232 interface performs the voltage level adaptation
(V24/CMOS
⇔
V24/V28) between the internal FX Series (DCE) and external applications (DTE).
The signals available on the RS232 serial link are as follows:

TX data (CT103/TXD)

RX data (CT104/RXD)

Request To Send (CT105/RTS)

Clear To Send (CT106/CTS)

Data Terminal Ready (CT108-2/DTR)

Data Set Ready (CT107/DSR)

Data Carrier Detect (CT109/DCD)

Ring Indicator (CT125/RI)
Figure 18. RS232 Serial Link Signals
The RS232 interface has been designed to allow flexibility in the use of the serial interface signals.
However, the use of TXD, RXD, CTS and RTS signals are mandatory; while the use of DTR, DSR,
DCD and RI signals are optional.
Tip: The FX Series is designed to operate using all serial interface signals and it is recommended to use
CT105/RTS and CT106/CTS for hardware flow control in order to avoid data corruption during
transmission.
The FX Series also implements the Serial Port Auto Shut Down feature with the DTR signal. It is
recommended to use the CT108-2/DTR signal to benefit from the current consumption
improvement performed by this feature.
5.1.2.2. RS232 Implementation
The following subsections describe how the RS232 serial link can be implemented to suit different
designs.
5.1.2.2.1. 5-wire Serial Interface RS232 Implementation
The signals used in this interface are as follows:

CT103/TXD

CT104/RXD