ERROR DETECTION AND RECOVERY IN A DMX512 NETWORK

摘要

A DMX512 network may include two gateway devices or two ports of a single gateway device, which are connected to a number of DMX512 devices. Under normal operating conditions, one gateway device or one port transmits and the other gateway device or the other port receives DMX512 frames. If there is a connection failure, then both gateway devices or both ports may transmit DMX512 frames. Once the connection is restored, the system may detect the restoration and one of the gateway devices or one of the ports ceases to transmit DMX512 frames.

主权项

1. A system for controlling DMX512 devices on a network comprising:
a first gateway device; and a second gateway device; wherein each gateway device includes a first port in communication with a network device and a second port connected to one of a plurality of DMX512 devices, wherein the plurality of DMX512 devices are connected in series and the second port of the first gateway device is connected to a first device of the plurality of DMX512 devices and the second port of the second gateway device is connected to a last DMX512 device of the plurality of DMX512 devices; wherein when the second gateway device operates in a standby mode, the second gateway device is configured to: receive a first network packet on the first port of the second gateway device from the network device, wherein the first network packet uses a first communication protocol; determine whether a frame corresponding to the first network packet was received on the second port of the second gateway device within a predetermined period of time; and when the determination is that no frame was received, enter a backup mode and transmit a backup frame on the second port to the last DMX512 device, wherein the backup frame uses a second communication protocol.