17
Ethernet Interface Board
The IC U4, 89C51 (microcontroller), performs the serial communication with the control board
and organizes these signals so they are compatible with the TCP/IP protocol and relay data to
IC U6 (W3100), which provides the TCP/IP stacks. The integrated circuit U3 (RTL8201B)
performs the functions of the Ethernet 10/100Mbps communication standard with the physical
device. In the EEPROM (U1) are stored the MAC and IP addresses of the network adapter.
The recognition of the interface connected to the control board is made with the reading of a
code associated to each kind of board through U101, enabled by the SELDEV signal generated
by the control board.
There are configuration jumpers: JP1 enables the manual reset of PCB, for test purposes (this
jumper must be open for the printer to work); J1, when closed, allows the IC U4 firmware
update (this jumper must be open for the proper operation of the printer). J3 jumper is
reserved and must be open for the printer to work properly.
Block Diagram
AT89C51RC2
CONTROL BOARD
RJ11 CONNECTOR
FCI CONNECTOR
(40 PINS)
INTERFACE
IDENTIFIER
IP/MAC
ADDRESS
ETHERNET
W3100RTL8201B
RESET
SRAM
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