Power Meter Operation
Configuring the Remote Interface
RS232/RS422
With RS232 selected as the serial interface the power meter communicates through the serial port with single ended drivers and receivers. With RS422 selsected, the serial port uses balanced drivers and receivers.
The power meter acts as a DTE device.
To select RS232 or RS422 as the remote interface press | System | , |
Inputs |
Remote Interface, Select Interface, RS232 or RS422.
RS232/422 Connector
The serial port connector is a 9 pin male
Figure 2-19: RS232/422 Pin Assignment
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| Pin | RS232 | RS422 | |
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| 1 | DCD | CTS- | |
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| 2 | Rx | Rx- | |
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| 3 | Tx | Tx+ | |
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| 4 | DTR | Tx- | |
1 | 2 | 3 | 4 | 5 |
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5 | GND | GND | ||||||
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| 7 | 8 | 9 | ||||
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| 6 | DSR | Rx+ | |
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| 7 | RTS | RTS+ | |
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| 8 | CTS | CTS+ | |
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| 9 | RI | RTS- | |
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HP E4419B User’s Guide |
