001package jmri.jmrix.roco.z21; 002 003/** 004 * Interface to send/receive serial information. 005 * 006 * @author Bob Jacobsen Copyright (C) 2001, 2006, 2007, 2008 007 */ 008public interface Z21Interface { 009 010 void addz21Listener(Z21Listener l); 011 012 void removez21Listener(Z21Listener l); 013 014 //boolean status(); // true if the implementation is operational 015 void sendz21Message(Z21Message m, Z21Listener l); // 2nd arg gets the reply 016 017}