5502A
Operators Manual
5-24
A summary of RS-232 terms, interface lines and mnemonics are shown in Table 5-2.
Table 5-2. RS-232 Interface Wiring
Mnemonic Description
CTS Clear to Send
DB-9 Type DB connector, 9 pins
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
RTD Request to Send
RX Receive Line
TX Transmit Line
IEEE-488 Interface Overview
The IEEE-488 parallel interface sends commands as data and receives measurements and
messages as data. The maximum data exchange rate is 1 Mbyte, with a maximum
distance of 20 meters for the sum length of the connection cables. One cable must not be
more than 4 meters in length. Some commands are kept for RS-232 serial operation
because these functions must be implemented as IEEE messages per the IEEE Standards.
For example, the command REMOTE could be sent as data with the IEEE-488 interface
to put the Calibrator into remote, but it is not because the remote function to be sent to
the device as the uniline message REN is necessary for the IEEE Standards. This is also
correct for other commands and functions, as shown below, with their equivalent RS-232
emulation. A summary of IEEE-488 messages is shown in Table 5-3.
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