Terminus T3 User Guide JA19-UM
Page 4 Rev: 00 Date: 05/25/17
© Copyright 2017 Janus Remote Communications
Specifications subject to change without notice
All Rights Reserved See website for latest revision. Not intended for life support applications.
T3 Connections continued
RS232
The DB9 port follows the standard for RS-232 communications and gives the connections for serial interaction with
hardware handshaking.
Pin
Description
Direction
1
DCD
Output
2
RXD
Output
3
TXD
Input
4
DTR
Input
5
GND
Supply
6
DSR
Output
7
RTS
Input
8
CTS
Output
9
RING
Output
USB
The USB B type port is directly connected to the modem, giving several interfaces in one connection for application
ease. This port can be used for various functions, including firmware updates of the modem. This port does not
provide power to the T3, which must come from the main terminal input.
LED Indicators
The T3 contains two LEDs for feedback to the user.
Status – Green LED
This LED is T3 feedback on readiness of the modem to accept commands, and is automatically controlled
internally. When the unit is available for communications this will be illuminated. When the modem is not ready,
either through external disable control or the use of low power AT+CFUN modes this LED will be turned off.
Logically, it is tied to the CTS (clear to send) signal.
Cellular – Amber LED
This LED is directly connected to the modem’s cellular status signal. It can be user controlled through AT
commands, or set to automatic control by the modem for cellular status feedback.
Please consult the modem AT command guide for control commands. AT#GPIO and AT#SLED are the common
commands.
Description of status:
LED Status
Device Status
Permanently Off
Cellular radio is off
Permanently On
On/Searching
Slow Blinking (0.3 sec on / 2.7 sec off)
Registered
Fast Blinking (0.5 sec on / 0.5 sec off)
Shutting down
