We present a graphical coordination language SGCCS as a language for modeling of coordination in discrete real-time. SGCCS can be viewed as a graphical version of the synchronous Calculus of Communicating Systems (SCCS). A specification in SGCCS contains both graphical and visual components. We give an example of the visual syntax and basic concepts of SGCCS, and then we formalize syntax of SGCCS defining a language of special terms. Using these terms, we precisely describe the visual syntax textually. Further, we define semantics of SGCCS via mapping of these terms into SCCS expressions.