Using a 4 pin serial LCD with a 3 pin connector?

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hello,

i have seeduino serial lcd http://www.seeedstudio.com/wiki/grove_-_serial_lcd_v1.0

this lcd has 4 wires connected it: vcc, gnd, rx, tx

i have arduino shield (can bus shield) has lcd connection on it, connect lcd. problem shield has 3 connections lcd. followed traces , vcc, gnd , digital 6.

from understanding should able connect vcc, gnd , digital 6 on shield rx of lcd , should work. not work.

i tried connecting lcd straight arduino using vcc, gnd , connecting rx of lcd digital pin, not work. if connect tx of lcd digital pin, works.

it makes sense because in code using softwareserial need specify both rx , tx pins in code...

code: [select]
seriallcd slcd(0,1)  /// (rx,tx)

how go using 3 wires on lcd? set rx pin in code (tx of lcd) if not connected?

thanks

quote
i have arduino shield (can bus shield) has lcd connection on it, connect lcd.


a link documentation shield appropriate.

don


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