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Cisco 1240 Connected Grid Router Hardware Installation Guide
OL-26223-04
Chapter 3 Router Hardware Description
Hardware Features Detailed Description
Serial Ports
The router has two serial ports for connection to legacy devices, such as remote terminal units (RTUs).
These ports support the following modes (selected with system software commands):
• RS232
• RS485
The ports are labeled as follows (see Figure 3-19):
• SER 1/1
• SER 1/2
Figure 3-19 Router Serial Ports
Before you connect a device to a serial port, you need to know the following:
• Type of device, data terminal equipment (DTE), or data communications equipment (DCE), you are
connecting to the synchronous serial interface
• Signaling standard required by the device
• Serial ports can be configured as DTE or DCE, depending on the serial cable used
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