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TIBBO EM120 Serial-to-Ethernet Module

Brief description

The EM120 serial-to-Ethernet module is an upgrade of Tibbo's original EM100 device. The device features larger routing buffers, additional I/O lines, and a number of other improvements. To achieve smaller dimensions, the module doesn't have Ethernet magnetics onboard.

Technical attributes:

Ethernet Interface	10/100BaseT
Ethernet Magnetics	-
Ethernet connector (RJ45)	-
Serial Connection Features	TTL; full-duplex (RS232/RS422), halfl-duplex (RS485) ; RX, TX, RTS, CTS, DTR, DSR; Baud: 150-115200bps;
Number of additional universal I/O Lines	5
Routing buffer size (bytes)	12Kx2
Average Power Consumption	50mA, 5V DC
Device temperature during operation	25 °C
Dimensions (mm)	35 mm x 27,5 mm x 9,1 mm
Serial Port	1 x UART, Wiegand, clock/data
Number of I/O lines	9
Max. load current for each I/O line	10 mA
Flash memory	64 KB
EEPROM memory	2040 B
Supported network protocols	UDP, TCP, ARP, ICMP (PING), DHCP, PPPoE, LCP
Number of simultaneous UDP or TCP (HTTP) connections	16
Nominal power supply voltage	5 V
Max. operating current	50 mA
Max operating relative humidity	90 %
Serial-over-IP	+
Programmable	-
Power supply range	-
Operating temperature	-10°C - 70°C
Additional peripherals	-

Technical Description

The EM120 is an Ethernet Module for onboard installation. Module hardware includes
one 10BaseT Ethernet port (standard Ethernet magnetics are NOT integrated into
the Module), one serial port (CMOS-level) with a number of additional generalpurpose
I/O lines, and an internal processor, whose firmware acts as a bridge
between the Ethernet and serial ports. Ethernet "side" of the Module connects
directly to a standard Ethernet magnetics circuit (such as YCL-20F001N) or RJ45
connector with integrated magnetics. Serial "side" interfaces directly to the serial
port pins of most microcontrollers, microprocessors, UARTs, etc.
From the hardware standpoint, the EM120 can be viewed as a universal platform
suitable for running a variety of network and serial communications-related
applications. It is the application firmware, not hardware that gives the EM120 most
of its functionality.
The Application firmware EM120 is supplied with, currently in its 3rd generation
("Release3"), turns the EM120 into a Serial Device Server used to connect serial
devices to the Ethernet (TCP/IP) networks.
The application firmware of the EM120 can be upgraded through the module's serial
port or Ethernet port. Serial upgrades are facilitated by a so-called Monitor- a fixed
"service" firmware inside the EM120. The Monitor cannot be upgraded. Network
upgrades rely on the application firmware itself- there is a self upgrade algorithm that will be detailed later.
Since most of the EM120's operation is defined by its firmware the major part of
EM120's functional description can be found in the
Device Server Application Firmware Manual. This EM120 Ethernet Module Manual
focuses on the hardware portion of the EM120.
Ethernet port of the EM120 is of 10BaseT type. Onboard electronics of the EM120
do not include Ethernet magnetics, so magnetic circuitry must be connected
externally. You can use either a standalone magnetics part (such as YCL-20F001N)
or RJ45 connector with integrated magnetics.
It is important to make the PCB wire connections between the Ethernet port pins of
the EM120 and external magnetics circuitry as short as possible. Making the wires
too long may cause the noise level generated by your PCB surpass the maximum
radiated emission limits stipulated by FCC and CE regulations. Additionally, longer
Ethernet lines on the PCB will make your board more susceptible to the damage from
the ESD (electrostatic discharge).