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RM3 SERIES BACKREFLECTION METER
USER’S MANUAL
Programming Guide
RS232 Serial Interface
The RM meter is equipped with an RS232 serial interface. Through the RS232 connection, the user can download measured values of backreflection, loss, and power to a computer or printer. The RM meter can also use an IEEE 488 parallel interface through the external RS232-
The RS232 serial interface is configured as data terminal equipment (DTE). The data protocol is set to 2400 baud, ASCII character code with eight bits per character, two stop bits, and no parity bit.
RS232 Pin Assignment
The RS232 pin assignment is shown in Figure 11.
Figure 11: RS232 Pin Assignment
RS232 Interface Specifications
The RS232 interface specifications are listed in Table 8.
Table 8: RS232 Interface Specifications
Name | Symbol | Pin Number | Signal Direction |
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Transmitted data | TxD | 2 | → |
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Received data | RxD | 3 | ← |
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Request to send | RTS | 8 | → |
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Clear to send | CTS | 7 | ← |
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Data carrier detect | DCD | 4 | ← |
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Data terminal ready | DTR | 6 | → |
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Signal ground | SG | 5 | ↔ |
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To connect the RM meter to the serial port of a computer:
1.Attach a
10112341 Rev 002 | Page 37 of 39 |