GSM9000 RF Solutions, GSM9000 Datasheet - Page 20

• Manufacturer Part Number: GSM9000
• Description: Tri-band Wireless Module Supporting Both GSM And GPRS
• Manufacturer: RF Solutions

Specifications of GSM9000

• No. Of Channels: 2
• Frequency Rf: 1.8GHz
• Module Interface: Serial, UART
• Kit Contents: Module Board Docs
• Tool / Board Applications: Wireless Connectivity-ZigBee, RF, Infrared, USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Product Description
Huawei GTM900 GSM/GPRS Wireless Module
4.1 About This Chapter
4.2 UART Interface
This chapter presents the application of the interfaces from the following aspects:
The UART interface realizes serial communications with external devices, supporting
level input and level output at 3.00 V (VDD_MSM_P).
All the signals over the UART interface are triggered at low level except RXD and TXD.
The latter two are triggered at high level.
The UART interface supports both transmit FIFO (First In First Out) and receive FIFO at
512 byte, programmable data width, programmable data stop bit, and programmable
parity check or non check. The maximum rate the UART interface supports is 115.2
kbps. The default rate is 9600 bps.
See Table 4-1 for detailed description of the UART interface signals.
Table 4-1 Signals over UART interface
23
17
20
18
16
22
21
No.
UART Interface
SIM Interface
Audio Interface
Ringer Interface
Power Supply Interface
Chapter 4 Interface Application
UART_DCD
UART_RI
UART_RTS
UART_TXD
UART_DSR
UART_DTR
UART_CTS
Signal name
Huawei Technologies Proprietary
Carrier detection
Ringer indication
Request transmit
Transmit data
Data services
ready
Data terminal
ready
Clear transmit
Description
4-1
Data links already
connected
Notifying DTE of
remote call-in
DTE sends Request
transmit message to
DCE
DTE transmits data
DCE is ready for
data services
DTE is ready
DCE is switched to
the Rx mode
Characteristic
Chapter 4 Interface Application
DCE-DTE
DCE-DTE
DTE-DCE
DTE-DCE
DCE-DTE
DTE-DCE
DCE-DTE
Direction