User's Manual

Appendix B: Reference Information
V1.5 BlueTree Wireless M2M Express Product Manual 35
Appendix B: Reference Information
Modem Reference The M2M Express is a rugged modem for the GPRS wireless data
network.
Features • Compatible with GSM and GPRS wireless services
• Supports 850 and 1900 MHz frequency bands
• SMS capable – for both mobile originate and terminate messaging
• Data transfer with a host platform through an RS-232 serial
interface
• Modem control protocol: AT commands
LED indicators
Data connection The serial cable data connection on the modem is configured as shown
in the illustration below.
LED Condition Corresponding State
DTR ON Data Terminal Ready detected. (PC ready to exchange data.)
TX ON Transmitting data.
RX ON Receiving data.
CD ON Data Carrier detected
PWR ON Modem is ON.
PWR Flashing
1/4 second ON /
1/4 second OFF
Modem is ON and transferring data over the wireless
network.
PWR Flashing
1 second ON /
1 second OFF
Modem is ON but has no service.