The Serial Communications Board is an Inner Board equipped with 2 ports that can be used to connect host computers,
Programmable Terminals, external serial devices, or Programming Devices other than a Programming Console.
• Unlike the CPU Unit’s built-in ports, the Serial Communications Board supports the protocol macro function which can improve communications between the CQM1H and external serial devic-es.
• The Serial Communications Board has 2 ports: an RS-232C port and an RS-422A/485 port. The RS-422A/485 port supports
1:N connections (protocol macro or NT Link in 1:N mode) with-out an adapter.
Communications Modes
The following 6 communications modes can be set independently for the two Serial Communications Board ports.
• Host Link: Communications with a host computer, Programming Device, or Programmable Terminal
• No-protocol: No-protocol communications (TXD and RXD) with standard external devices
• Protocol macro: Communications according to the external device’s communications specifications
• 1:1 Data Link: Data link with a CQM1H, CQM1, or other C-series PLC
• NT Link in 1:N mode: One-to-one or one-to-N communications with Programmable Terminals
• NT Link in 1:1 mod: One-to-one communications with Programmable Terminal