Programming Guide; Rs232 Serial Interface; Rs232 Pin Assignment; Rs232 Interface Specifications - JDS Uniphase BACKREFLECTION METER RM3750 User 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-
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 11.

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 RM 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.
10112341 Rev 002
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Figure 11: RS232 Pin Assignment
Symbol Pin Number
TxD 2
RxD 3
RTS 8
CTS 7
DCD 4
DTR 6
SG 5
RM3 SERIES BACKREFLECTION METER
Signal Direction
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USER'S MANUAL
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