T61 Smart Modem
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User Guide V1.4
2
Device Overview
T61 is a smart gateway connecting serial devices with RS232 or RS485 interfaces to
GSM/GPRS/HSPA/LTE network. It is integrated with a 32bit ARM Cortex-M0+ core processor and a
Gemalto 3G or 4G modem module. Equipped with comprehensive features, T61 smart gateway
provides industrial standard flexibility, scalability and data reliability.
T61 Smart Modem has two operation modes, namely Normal Modem Mode and Smart Modem
Mode. In Normal Modem Mode, T61 functions as a standard 3G or 4G modem by providing a direct
serial access to a Gemalto EHS5 or ELS61 module. User could send AT command to achieve various
functions, such as SMS, GSM/GPRS/3G/4G connections for data transfer. In Smart Modem Mode,
T61 provides a transparent channel from remote end devices to their dedicated data centers. It can
be configured as server or client, accept SIM card with dynamic IP or static IP, support TCP/UDP,
schedule to connect, connect on demand or “always on” connection, and with Auto Recovery, Re-
connection and Redundancy mechanisms.
As compare to PSTN or GSM dial up line or lease line, T61 smart gateway allows you to migrate your
remote device from traditional serial communication system to the advance GPRS or 3G/ 4G link,
without tedious application development or in depth knowledge of AT command or GPRS/ 3G/ 4G.
You can view this device as the “virtual serial wire over the air”, that links all your remote equipment
to the central PC. It can be a full transparent, protocol independent gateway, used for AMR, SCADA,
general remote monitoring, control and data exchange applications. It is designed for mission critical
industrial applications.
Two operation modes:
Normal Modem:
The Data Terminal Equipment (DTE, such as PC, PLC, energy meters,
controller etc.) is intelligent and can issue various AT commands to T61 normal modem as
DCE (Data Communication Equipment) to establish SMS send /receive, GSM/GPRS/HSPA/LTE
dial up connection etc.
Smart Modem:
In this mode, T61 Smart Modem can be configured with all essential
parameters to manage connections. It connects to assigned data centre server automatically
upon power up and sets up a transparent serial-to-wireless communication channel
between remote devices and data centre. During operation, T61 Smart Modem can maintain
the wireless connection and re-establish connection to data centre server in case of
connection lost. It can monitor site conditions or connections status, such as signal strength,
online/offline etc. It shall be an easy retro-fit solution for existing wired system to 3G/ 4G
mission critical wireless system.
2.1
Key Specification at a glance
Specifications
T61 – EHS5
T61-ELS61
General
Wireless Module
Built in with Gemalto EHS5-E
Built in with Gemalto ELS61-E
CPU
32 bits ARM Cortex-M0+
Transfer Protocol
TCP/UDP
Operational Mode
Normal Modem
1
or Smart modem
2
(Client or Server mode)
SIM card
1.8/3V, dynamic or static IP