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RS-232 Interface Overview
The Calibrator RS-232 port is designed in accordance with EIA (Electronic
Industries Association) standard RS-232-C. RS-232 is a serial binary data
interchange operating at 9600 baud and distances up to 50 feet. The Calibrator rear
panel serial port is configured as DTE (Data Terminal Equipment). For detailed
information, see the EIA standard RS-232-C.
A summary of RS-232 terms, interface lines and mnemonics are shown in
Table 4-1.
DB-9
DTE
GND
RX
TX
Setting up the IEEE-488 Port for Remote Control
The Calibrator is fully programmable for use on the IEEE Standard 488 interface
bus. The IEEE-488 interface is also designed in compliance with supplemental
standard IEEE-488.2, which describes additional IEEE-488 features. Devices
connected to the IEEE-488 bus are designated as talkers, listeners, talker/listeners,
or controllers. Under remote control of an instrument, the Calibrator operates as a
talker/listener. Figure 4-3 shows typical IEEE-488 remote control connections.
A PC equipped with an IEEE-488 interface controls the Calibrator. Compatible
software for IEEE-488 operation, MET/CAL, may be purchased from Fluke.
When using the IEEE-488 remote control interface, there are two restrictions:
1. Number of Devices A maximum of 15 devices can be connected in a single
IEEE-488 bus system. For example, one instrument controller, one Calibrator,
and thirteen units under test (UUTs).
2. Cable Length The total length of IEEE-488 cables used in one IEEE-488
system is 2 meters times the number of devices in the system, or 20 meters,
whichever is less. For example, if 8 devices are connected, the maximum cable
length is 2 x 8 = 16 meters. If 15 devices are connected, the maximum cable
length is 20 meters.
Table 4-1. RS-232 Interface Wiring
Mnemonic
Type DB connector, 9 pins
Data Terminal Equipment
Ground
Receive Line
Transmit Line
Remote Operation
RS-232 Interface Overview
Description
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