The user is expected to have working knowledge of the MODBUS protocol. For more information on MODBUS, go to: www.modbus.org, where you can also find the references listed in Section 7.
MODBUS is a serial communications protocol designed to allow a number of different devices to communicate with a single MODBUS master. The current AquaVent 5 logger and the previous AquaVent logger are able to communicate with a MODBUS master using the AquaVent 5 SPX Wellhead or AquaVent SPX Wellhead, and a RS-232/RS-485 Connector Cable.
As features differ slightly between models, it is recommended to use the AquaVent 5 Wellhead with an AquaVent 5 logger.
The SPX Wellhead converts MODBUS commands to the Solinst communications protocol for AquaVent. The SPX Wellhead and Connector Cable provide a hardware and protocol conversion interface between a Solinst AquaVent logger and a MODBUS network.