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3. IEEE-488 PARALLEL INTERFACE
3.1 Connection
This conforms to specification ANSI/IEEE Std 488.1-1987 "Digital Interface for
Programmable Instrumentation." A list of pin assignments is given in Appendix III.
3.2 Front Panel Set-up
Press “MENU” on the front panel and select ”Rem I/F”. On the next menu, select
“IEEE”. A further menu allows selection of Talk Only mode or Address.
If no IEEE card is fitted the warning message “** OPTION NOT AVAILABLE **” is
displayed.
Talk Only Mode
This mode is useful for sending results directly to a printer without the need for a PC.
Select “ON” to set the Talk Only mode. In this mode, the interface will ignore all
incoming interface commands, and the instrument will remain in LOCAL control mode.
The result of each measurement is sent to the interface output with the same
resolution as the main display. If the Temperature Compensation is selected, then the
compensated resistance will be sent. See section 4.1 for output data format.
Addressable Mode
On selecting Address (“Addr”), the current setting is displayed. This defaults to 8
following a RESET operation and is the usual setting on shipment. If this is
acceptable press “OK”.
To change the value, press “Chg” and enter the new address (0-31).
Addresses 0 to 30 are recognised as valid addresses for full bus communication.
Address 31 is used to isolate an instrument from the bus without the need to
disconnect it physically.
3.3 Interface Functions
The interface performs the following functions;
SH1, AH1, T5, TE0, L3, LE0, SR1, RL1, PP0, DC1, DT1, C0, E2
These have the following meanings;
SH1
Source Handshake
The device can send multiline messages.
AH1
Acceptor Handshake
The device can receive multiline messages.
T5
Talker Capability
The device; can act as a basic talker
; can respond to a serial poll
; can perform a talk only mode
; unaddresses if MLA sent
