Led Indicators; Rs232 15-Pin Connector Pinout - Multitech MultiModem MTCBA-G-F1 User Manual

TD. Transmit Data.
RD. Receive Data.
CD. Carrier Detect.
LS. Line Status.
TR. Terminal Ready.
PWR. Power.

RS232 15-Pin Connector Pinout

PIN
1
6
2
8
RS
9
232
7
12
11
13
Audio 4
5
10
15
Boot 3
Reset 14
Multi-Tech Systems, Inc. MultiModem® GPRS User Guide

LED Indicators

Lit when modem is transmitting data.
Lit when modem is receiving data.
Lit when data connection has been established.
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.
Commonly called "Data Terminal Ready." This is a readiness signal from
the PC.
Indicates presence of DC power when lit.
5
10
1 5
EIA
DCD 109
RX 104
TX 103
DTR 108.2
GND
DSR 107
RTS 105
CTS 106
RI 125
MICROPHONE (+)
MICROPHONE (-)
SPEAKER (+)
SPEAKER (-)
BOOT
RESET
Chapter 1 – Description & Specification
1
6
11
CCIT Designation
Data Carrier Direct
Receive Data (out)
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
For factory use only.
To reset, connect to GND
momentarily. Open for normal
operation.
11