Baud Rate (5)īaud rate is the rate at which data is transmitted across the connection in bits per second (bps). Slaves can be addressed from 1 through 90 for DirectNET protocol or 1 through 247 for MODBUS protocol, depending on the slave and CPU. Typically this is set to 1 for the master. This is the number that will be polled by the master on the network. The station number is the slave number or address. For 2-wire networks, the values should be increased to 5ms and 2ms respectively. RTS on and RTS off delay can typically be set to 0ms for 4-wire networks. RTS (Request to Send) is a handshaking signal to notify another device that the asserting device would like to transmit. for K-Sequence, Base Time-out x 1 = 800ms. Notice the selection is relative to the Base Time-out listed next to each protocol, i.e.
It is only used when the PLC is the master device. Time-out is the amount of time the port will wait for a response to a message it sent before it logs an error. These are the default protocols for the slave PLCs discussed in part one of this article. You will notice in figure 2 that K-sequence, DirectNET and MODBUS protocols (1) are all checked by default. Each of these protocols will require some configuration. There are three protocols available: standard, non-sequence and remote I/O. The setup window (shown in figure 2) will appear. Then from the drop-down menu select Setup (2), then Setup Sec.
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In the DirectSOFT software menu, select PLC (1).
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In this issue we will discuss how to configure the communication port using DirectSOFT programming software while connected to the CPU. We covered networking, wiring diagrams and protocols. In the previous issue of Automation Notebook, Winter 2005 Issue 3, we discussed the communications capabilities of Port 2 on the DL06, DL250-1 and DL260 DirectLOGIC CPUs.
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