Operating instructions

R&S ESCI Instrument Interfaces
1166.6004.12 8.3 E-1
IEC Bus Interface
The standard instrument is equipped with an IEC/IEEE Bus connector. An IEEE 488 interface connector
is located on the rear panel of the R&S ESCI. An external controller for remote control of the instrument
can be connected via the IEEE 488 interface connector using a shielded cable.
Interface Characteristics
• 8-bit parallel data transfer
• bi-directional data transfer
• three-line handshake
• high data transfer rate of max. 350 kbyte/s
• up to 15 instruments can be connected
• maximal length of the interconnecting cables 15 m (single connection, 2m)
• wired-OR connection if several instruments are connected in parallel.
12
1
13
24
SHIELD SRQ NDAC DAV DIO4 DIO2
LOGIC GND GND(10) GND(8) GND(6) DIO8 DIO6
GND(11) GND(9) GND(7) REN DIO7 DIO5
ATN IFC NRFD EOI DIO3 DIO1
Fig. 8-3 Pin assignment of IEC-Bus interface
Bus Lines
1. Data bus with 8 lines DIO 1 to DIO 8.
The transmission is bit-parallel and byte-serial in the ASCII/ISO code. DIO1 is the least significant,
DIO8 the most significant bit.
2. Control bus with 5 lines.
IFC (Interface Clear),
active low resets the interfaces of the devices connected to the default setting.
ATN (Attention),
active low signals the transmission of interface messages
inactive high signals the transmission of device messages.
SRQ (Service Request),
active low enables a device connected to send a service request to the controller.