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Section 1-3 Protocol Overview 2. A 1:1 NT Link is not supported. 3. No-protocol mode can be used with CS/CJ-series CPU Units with Unit Ver. 3.0 or later only. A connection example for each serial communications mode is shown in the following sections for a Serial Communications Unit. The examples apply equally as well to the Serial Communications Boards. 1-3-1 Host Link Mode In Host Link mode, C-mode commands (Host Link commands) or FINS commands can be sent from a host computer to read or write I/O memory in the PLC or to control the PLC’s operating modes. The host computer can be a personal computer or a Programmable Terminal. The FINS commands are sent with other data, such a Host Link header and terminator. In Host Link mode, SEND(090), RECV(098), and CMND(490) instructions can be used to send FINS commands from PLC to the host computer to read data, write data, or perform other operations. This is called slave-initiated communications or unsolicited communications. The FINS commands are sent with other data, such a Host Link header and terminator. Note 1. FINS commands can be sent across up to three different networks (counting the local network) to a PLC on a remote network or to a host computer connected to a PLC on a remote network. 2. Programming Devices can also be connected in Host Link mode. Sending C-mode Commands Host Link C-mode (Host Link) command Sending FINS Commands FINS commands can also be sent to PLCs on remote networks. FINS command Host Link FINS command Host Link FINS command Host Link terminator Host Link header 8 Host Link terminator Host Link header Remote network (Controller Link or Ethernet)
