Diamond Systems Janus-MM

Introduction

JANUS-MM combines dual CAN bus interfaces with sockets for wireless communications and GPS to create a complete I/O subsystem for automotive and vehicle tracking applications. The dual CANbus ports use the Philips SJA1000T CAN controller and 82C251 transceiver, for full CAN2.0B functionality. Each port is independently isolated from the system to eliminate sensitivity to noise and ground shifts in the network. Jumper options include slew rate control, transceiver power source (on-board or loop power), address, and interrupt settings. Both memory and I/O addressing are supported. For ruggedized applications, 0Ω jumper-bypass resistors can be installed in any configuration.

JANUS-MM includes sockets and support circuitry for GSM/GPRS and CDMA wireless communication modules from MultiTech, as well as 8-channel and 12-channel GPS receivers from Trimble Navigation. A connector is provided to supply backup power for the GPS almanac. A built-in dual UART circuit provides the necessary interface to the modules. The add-on modules are available separately based on your desired configuration. See below for information on available modules.

Block Diagram

Wireless/GPS Add-on Modules

Janus-MM supports the addition of various modules for location identification and wireless communications. One wireless module and one GPS module can be installed simultaneously on a single Janus-MM board. These modules are purchased separately and installed on the board with the included hardware kit. Transition cables are available for each module to connect between the module and the enclosure wall.

Lassen iQ GPS

• L1 frequency, 12 channel receiver
• TSIP, NMEA, and TAIP protocols
• 1Hz location update rate
• 1 pulse per sec precision output
• Battery backup option for faster warm start capability
• H.FL-R-SMT low-profile antenna connector
• -40 to +85°C operation
• See here for more details

SocketModem GSM/GPRS

• 850/1900 or 900/1800MHz operation
• Packet data up to 85.6kbps
• Circuit-switched data up to 9600bps
• GSM class 1 and class 2 group 3 fax
• SMS capability
• MMCX antenna connector
• SIM socket
• -30 to +70°C operation

SocketModem CDMA

• 800/1900MHz operation
• Packet data up to 153.6kbps
• Circuit-switched data up to 14,400bps
• Class 2 group 3 fax
• SMS capability
• MMCX antenna connector
• SIM socket
• -30 to +70°C operation