Sealevel Systems Inc.

540M SeaI/O-540M RS-485 Modbus RTU Interface to 32 Open-Collector Outputs

540N SeaI/O-540N Expansion Module 32 Open-Collector Output SeaI/O Expansion Module

540S SeaI/O-540S RS-232 Modbus RTU to 32 Open-Collector Outputs

540U SeaI/O-540U USB to 32 Open-Collector Outputs

540W SeaI/O-540W Expansion Module: SeaI/O-520W Wi-Fi 802.11b/g Modbus TCP to 32 Open-Collector Outputs

SeaI/O-641U: USB to 4 Channel RS-232

SeaI/O-647U: USB to 4 Channel RS-232/485

SeaI/O-681U: USB to 8 Channel RS-232

SeaI/O-687U: USB to 8 Channel RS-232/485

ULTRA 530.PCI: 1 Port PCI 16550 UART RS-232/422/485/530(Auto 485) Interface, discontinues, build to order! Successor 7106S, obsolete but in stock