Tibbo Ethernet-to-Serial Devices
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Tibbo Ethernet-to-Serial Devices

Tibbo Ethernet-to-Serial Devices

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41 <strong>Tibbo</strong> Document System<br />

Expansion 2.2.2.4 connec<strong>to</strong>r pin assignment<br />

15-pin expansion connec<strong>to</strong>r has the following pin assignment:<br />

P0<br />

P1<br />

P6<br />

P7<br />

P8<br />

GND<br />

VCC<br />

RST<br />

MD<br />

DTR<br />

RTS<br />

TX<br />

RX<br />

CTS<br />

DSR<br />

Connected <strong>to</strong> pin P0 of EM120/EM200<br />

Connected <strong>to</strong> pin P1 of EM120/EM200<br />

Connected <strong>to</strong> pin P6 of EM120/EM200<br />

Connected <strong>to</strong> pin P7 of EM120/EM200<br />

Connected <strong>to</strong> pin P8 of EM120/EM200<br />

Ground<br />

+5V from the EM120/EM200-EV board. Available "spare" current about 50mA<br />

Reset (active high) from the EM120/EM200-EV board. The signal is generated<br />

by an onboard reset IC. The same signal is applied <strong>to</strong> pin RST of<br />

EM120/EM200<br />

Connected <strong>to</strong> the download/setup but<strong>to</strong>n on the EM120/EM200-EV board.<br />

The signal is connected <strong>to</strong> pin MD of EM120/EM200<br />

Connected <strong>to</strong> pin P3(DTR) of EM120/EM200<br />

Connected <strong>to</strong> pin P5(RTS) of EM120/EM200<br />

Connected <strong>to</strong> pin TX of EM120/EM200<br />

Connected <strong>to</strong> pin RX of EM120/EM200<br />

Connected <strong>to</strong> pin P4(CTS) of EM120/EM200<br />

Connected <strong>to</strong> pin P2(DSR) of EM120/EM200<br />

Output signals that are present both on the DB9M and expansion connec<strong>to</strong>rs (DTR,<br />

RTS, TX) need not be switched. So, for example, the TX (output) line from the<br />

EM120/EM200 is connected <strong>to</strong> the RS232 transceiver IC and <strong>to</strong> the expansion<br />

connec<strong>to</strong>r. For input signals (RX, CTS, DSR) there must be a way <strong>to</strong> disconnect the<br />

RS232 transceiver IC from the EM120/EM200. Three jumpers (combined with pins<br />

RX, CTS, DSR of the expansion connec<strong>to</strong>r) serve this purpose.<br />

For example, when the RX jumper is closed the RX pin of the EM120/EM200 receives<br />

a signal from the RS232 transceiver. When the jumper is opened you can use the RX<br />

pin on the expansion connec<strong>to</strong>r <strong>to</strong> supply a TTL RX signal from your own external<br />

board. Figure below illustrates this.<br />

Maximum load for all CMOS-type lines (P0, P1, ... RX, TX...) is 10mA.<br />

©2000-2004 <strong>Tibbo</strong> Technology Inc.

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