Selecting The Remote Interface Port; Configuring The Ieee-448 Port; Ieee 488 Operating Limitations; Setting The Ieee 488 (Gpib) Port Address - Fluke 8845A Programmer's Manual

8845A/8846A
Programmers Manual

Selecting the Remote Interface Port

To enable or select a port for remote control of the Meter:
1. Press I.
2. Press PORT IF.
3. Press SELECT PORT.
4. Press the soft key labeled with the desired port: RS-232C, IEEE488, or LAN.
Port selection is non-volatile. Therefore, the selected port will remain active until another
port is selected through the front panel.

Configuring the IEEE-448 Port

The IEEE 488 interface is designed in compliance with supplemental standard IEEE
488.2. Devices connected to the bus in a system are designated as talkers, listeners,
talker/listeners, or controllers. The connector for connecting the Meter to the IEEE 488
bus is located on the rear panel. Under control of an instrument controller, the Meter
operates exclusively as a talker/listener on the IEEE 488 bus.
The Meter conforms to the Standard Specification IEEE 488.1 – 1987: IEEE Standard
Digital Interface for Programmable Instrumentation, and to IEEE 488.2 - 2004: Codes,
Formats, Protocols, and Common Commands.

IEEE 488 Operating Limitations

The following limitations govern the IEEE 488 remote interface:
• A maximum of 15 instruments may be connected in a single IEEE 448 bus system.
• The maximum length of IEEE 488 cable used on a single IEEE 488 system must be the
lesser of 20 meters, or 2 meters times the number of devices in the system.

Setting the IEEE 488 (GPIB) Port Address

Before the Meter will accept commands through the IEEE 488 remote interface, IEEE
488 must first be enabled or selected as the active interface port. This can only be done
through the Meter's front panel.
A controller uses an address between 1 and 32 to identify a specific instrument on the
bus. The Meter is shipped from the factory with the IEEE 488 port address set to 1. To
change the IEEE 488 address:
1. Press I.
2. Press PORT IF.
3. Press IEEE488.
4. Use the soft keys to set the address as follows.
5. With the desired address set, press ENTER.
4
Select the address digit to adjust by pressing either <-- or -->.
With the desired digit selected, press the soft key labeled -- to decrement the digit
or ++ to increment the character.