5560A/5550A/5540A
Remote Programmers Manual
12
RS-232 Interface Overview
The RS-232 port is a EIA (Electronic Industries Association) standard RS-232. RS-232 is a serial
binary data interchange that operates from 9600 baud to 115200 baud (selectable), and distances up
to 50 feet. The Calibrator rear-panel RS-232 port is configured as DTE (Data Terminal Equipment).
See Figure 1. See RS-232/IEEE-488 Cables and Connectors.
For detailed information, see the EIA standard RS-232.
A summary of RS-232 terms, interface lines and mnemonics are shown in Table 4.
Table 4. RS-232 Interface Wiring
Mnemonic Description
CTS Clear to Send
DB-9 Type DB connector, 9 pins (See Figure 1)
DB-25 Type DB connector, 25 pins
DCD Data Carrier Detect
DCE Data Communications Equipment
DSR Data Set Ready
DTE Data Terminal Equipment
DTR Data Terminal Ready
GND Ground
RI Ring Indicator
RLSD Received Line Signal Detector
RTS Request to Send
RX Receive Line
TX Transmit Line
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