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5820A
Operators Manual
return the 5820A Calibrator to the local with lockout state, send the RS-232 LOCAL
command or the IEEE-488 GTL (Go To Local) message and unasserts the REN line.
Table 5-1 summarizes the possible Remote/Local state transitions. (For more information
on IEEE-488 GPIB messages, see "IEEE-488 Overview."
From
Local
Remote
Local with Lockout
Remote with
Lockout
5-21. RS-232 Interface Overview
The two 5820A Calibrator RS-232 ports are designed in accordance with EIA (Electronic
Industries Association) standard RS-232-C. RS-232 is a serial binary data interchange
operating from 300 to 9600 baud (selectable), and distances up to 50 feet. The 5820A
Calibrator rear panel SERIAL 1 FROM HOST port is configured as DTE (Data Terminal
Equipment) while the SERIAL 2 TO UUT is configured as DCE (Data Communications
Equipment). See Appendix D for RS-232 cable and connector information. For detailed
information, see the EIA standard RS-232-C.
A summary of RS-232 terms, interface lines and mnemonics are shown in Table 5-2.
5-24
Table 5-1. Operating State Transitions
To
Remote
Local with Lockout
Local
Go to Local
softkey
Remote with Lockout
Local
Remote with Lockout
Local
Local with Lockout
Table 5-2. RS-232 Interface Wiring
Mnemonic
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
Front Panel
GPIB
Message
MLA + (REN True)
LLO
GTL or REN False
LLO
REN False
MLA (REN True)
REN False
GTL
Description
Serial
Command
REMOTE
LOCAL
LOCAL
LOCKOUT
LOCAL
REMOTE
LOCAL
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