1689-9640
Digibridge IEEE-488.2 Board
Page 1
Overview
The optional Digibridge IEEE-488.2 interface board provides IEEE-488.2 (GPIB) and RS-232
Serial interfaces to the Digibridge 1689/1693 series instruments via 24-pin GPIB and 9-pin male
serial connectors. The interface can be used to connect directly to a controller or to a bus
comprising of multiple instruments and a controller. All instruments on the IEEE-488.2 bus must
meet the IEEE Standard 488.2-1987 (Standard Digital Interface for Programmable
Instrumentation).
The IEEE-488 interface board supports the IEEE-488.2 and SCPI interface standard and
communication protocol. The physical, electrical, signal and protocol standards of the
IEEE-488.1-1987, IEEE-488.2-1987 and SCPI-1999 standards are supported.
The following IEEE-488 functions are implemented:
AH1 Acceptor Handshake (Listener)
SH1
Source Handshake (Talker)
T5
Talker with normal and talk-only modes (for systems without a controller), switch
selectable on the rear panel.
L4
Listener.
SR1
Service Request (to request service when measurement is complete and the instrument is
not addressed to talk).
RL2
Remote/Local (no local lockout, no return-to-local switch).
PP0
No Parallel Poll.
DC1 Device Clear.
DT1
Device Trigger (to start measurement).
C0
No controller functions.
E2
Electrical Interface.
Configuration
The Digibridge IEEE-488.2 interface board has two switches for setting operating configuration,
SW1, the Talk-Listen / Talk-Only toggle switch, and S2, the GPIB Address selection DIP switch.
Talk-Listen / Talk-Only Toggle Switch
The SW1 red toggle switch is used to select between the Talk-Listen and the Talk-Only
operating modes. If no controller (or PC) will be used to control the Digibridge via either the
IEEE-488 or RS-232 interfaces, then the SW1 toggle switch should be set to Talk-Only. For
controlling the Digibridge externally via either interface, the SW1 toggle switch should be set to
Talk-Listen.
