In the real digital channel, only quantized symbolic data can be transmitted. Therefore, the quantized consensus
problem of continuous-time first-order agents under switching communication topologies is investigated. Each agent uses the uniformly quantized states received from its neighbors to update its state, and quantized consensus is achieved. Under the proposed protocol and assumptions, all the states can go into the quantization bin containing the average of initial states in finite time. Particularly, under time-invariant topologies, the upper bound of the convergence time is given. Simulation results demonstrate the effectiveness of the proposed protocol.