Multitech MultiModem MTCBA-G-F4 - Interfaces Overview

Chapter 1 – Product Description and Specifications
10 Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide
Interfaces
LEDs
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.
RS232 15-Pin Connector Pinout
10
11
6
15
15
PIN
EIA
CCIT
Designation
RS-232
1
DCD
109
Data Carrier Direct
6
RX
104
Receive Data (out)
2
TX
103
Transmit Data
8
DTR
108.2
Data Terminal Ready
9
GND
Signal Ground
7
DSR
107
Data Set Ready
12
RTS
105
Request to Send
11
CTS
106
Clear to Send
13
RI
125
Ring Indicator
Audio
4
MICROPHONE (+)
5
MICROPHONE (-)
10
SPEAKER (+)
15
SPEAKER (-)
Boot
3
BOOT
For factory use only.
Reset
14
RESET
To reset, connect to GND momentarily
(typical: 2mSec). Open for normal operation.
AT Command Information
AT commands for the GPRS wireless modem are published in a separate reference guide. You can find
this guide on the Multi-Tech website.
IP commands for GPRS modems are also published in a separate reference guide. This guide is also
included on the Multi-Tech website.