The Subsea Instrumentation Interface Standardisation (SIIS), a JIP run by OTM Consulting, was established in 2003. With a remit to create an open standard for the benefit of the oil and gas industry as a whole, SIIS recently finished producing the Recommended Practice (RP) and text for an API Standard, which defines three instrument interface protocols for communication between subsea control modules and subsea sensors:
Level 1: Analogue Devices: These devices are 4-20mA sensors, 2 wire loop powered analogue output sensing devices.
Level 2: Digital Serial Devices (CANopen):
Level 3: Ethernet TCP/ IP Devices.
SIIS has 27 member companies consisting of controls systems suppliers, instrument suppliers and operators.