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Programming Guide
RS232 Serial Interface
The Backreflection 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 Backreflection Meter can also use an IEEE 488 parallel interface
through the external RS232-to-IEEE 488 converter (described in the RS232-GPIB Converter
section).
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 15.
RS232 Interface Specifications
The RS232 interface specifications are listed in Table 8.
Table 8: RS232 Interface Specifications
Name
Transmitted data
Received data
Request to send
Clear to send
Data carrier detect
Data terminal ready
Signal ground
To connect the Backreflection Meter to the serial port of a computer:
1. Attach a straight-through RS232 cable to the computer and the RS232C port at the back of
the meter.
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Figure 15: RS232 Pin Assignment
Symbol
Pin Number
TxD
2
RxD
3
RTS
8
CTS
7
DCD
4
DTR
6
SG
5
Signal Direction
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