User guide

WA_DEV_FEX20_UGD_002 Rev 004 March 08, 2011 42
Fastrack Xtend User Guide
Interfaces
Figure 18. V24 Serial Link Implementation for a 4-wire UART
5.1.2.1.1.3. 2-wire Serial Interface RS232 Implementation
The signals used in this interface are as follows:
 CT103/TXD
 CT104/RXD
Note: Although this case is possible, it is not recommended.
The flow control mechanism must be managed from the customer end.
Figure 19. V24 Serial Link Implementation for a 2-wire UART
The CT105/RTS and the CT106/CTS signals are not used in this configuration. Configure the AT
command AT+IFC=0,0 to disable the flow control function. Refer to document [7] Firmware 7.4a AT
Commands Manual (Sierra Wireless Software Suite 2.31)/Firmware 7.4 AT Commands Manual
(Sierra Wireless Software Suite 2.30) for more information regarding AT Commands.
For more information on how to use the RS232 serial link to communicate with the Fastrack Xtend,
refer to section 5.1.2.1 RS232 Serial Link Connection.