Chapter 2 – Installation
Interfaces
The Wireless MultiModem has several interfaces:
•LED function indicating operating status
•External antenna (via SMA connector)
•Serial and control link (via USB connector)
•Microphone and speaker (via handset jack)
•SIM card holder
LEDs
| LED Indicators |
TD | Transmit Data. Lit when modem is transmitting data. |
RD | Receive Data. Lit when modem is receiving data. |
CD | Carrier Detect. Lit when data connection has been established. |
LS | Line Status. |
| Continuous “on” state indicates that the wireless modem is not registered on the network. |
| Flashing state indicates registration on network. |
| Off state. Modem is off (not ready) or in download mode. |
TR | Terminal Ready. Commonly called “Data Terminal Ready.” This is a readiness signal from the PC. |
PWR | Power. Indicates presence of DC power when lit. |
AT Command Reference Guides
AT commands for the GPRS USB wireless modem are published in a separate GPRS AT Commands Reference Guide included on the MultiModem CD and posted on the
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