Basic graph for drawing some techy diagrams

ia_blocks_template.dot

Digraph G {

    compound = true;
    nodesep = 2;
    splines = ortho;
    node[shape=record, fontsize=12, fontname=Helvetica, style=filled, fillcolor=white];

    subgraph cluster_1 {
        label = "System 1";
        color = red;
        
        node_1;  
    }

    subgraph cluster_2 {
        label = "System 2";
        color = darkgreen;
        
        node_2;
    }

    node_1 -> node_2 [label="Label", dir=both];
    node_1 -> node_2 [ltail=cluster_1, lhead=cluster_2, dir=both];
}