The invention discloses a case. The case comprises a front wall, a rear wall, a top panel, a bottom panel, a left side wall and a right side wall and further comprises an upper baffle, a middle baffle and a lower baffle, wherein the upper baffle, the middle baffle and the lower baffle are fixed into the case from top to bottom. The upper baffle is provided with a shell used for installing waveform generating equipment; the middle baffle is provided with shells sequentially from bottom to top, wherein the shells are used for installing voltage grade adjustment equipment, virtual meter equipment, low-voltage PLC attenuation simulation equipment, low-voltage PLC length simulation equipment, RS485 wire length simulation equipment and carrier jamming simulation equipment respectively; the lower baffle is provided with a shell for installing voltage stabilizing and changing equipment and a shell for installing serial port server equipment sequentially from bottom to top. The case solves the problem of difficult wiring of a simulation test of a collecting system, thereby improving simulation test efficiency and saving labor cost.