GE DS200SDCCG4AGD Digital signal card

These ports can each support multiple protocols simultaneously. • Modbus RTU Slave, packaged as a serial stream on Ethernet. This is appropriate for conversion to serial Modbus at terminal servers or for the Trusted OPC servers and SOE/Process Historian collector. Up to ten connections can be made to Ethernet slaves, and the port only needs to be allocated once. Port 2000 is used by default. The slave can either actively make a connection (appropriate for some terminal servers) or wait for a connection. • Open Modbus Transport Control Protocol (TCP), an Ethernet Modbus protocol designed by Modicon. This will automatically operate if port 502 is selected. Only Modbus Slave is available on this protocol.

• Modbus RTU Master

 packaged as a serial stream on Ethernet. This is enabled by fitting a T8122 or T8123 Processor Interface Adapter. The Master only makes one connection, so it may connect to one Ethernet based slave or to one chain of slaves on a serial link via a terminal server. Each CI can control up to 16 Modbus Masters, communicating with up to 64 Slaves total, with up to 400 messages total. Each Master, Slave and message can be individually controlled and monitored, including statistical data. A Modbus Master can also broadcast messages to some or all Slaves simultaneously.

Rear Serial Ports 

These ports may be configured between 1200 and 115200 baud. All four ports support RS485, port 1 supports RS232 with full handshaking and port 2 supports RS232 without handshaking. These ports can be allocated as a Modbus Remote Terminal Unit (RTU) Slave or Master (Modbus Master requires a T8122 or T8123 Processor Interface Adapter).SOE over Modbus protocol. A section of the Modbus address map is used as an event buffer for SOE events (not Process Historian). This requires programming in the remote end to poll the data block (with a Modbus Master) and interpret the events. This can provide a faster event transfer than the protocol used by the OPC server and SOE collector.

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