Rohde & Schwarz CMW500 - GPIB Bus Interface

Annexes
R&S
®
CMW500
295User Manual 1173.9463.02 ─ 06
Table 7-1: Emulation codes supported by the compatibility modes
Purpose Direction (Controller) Agilent Codes IEEE1174 Codes
Poll Status Byte send
receive
POL\n
POL +stb\n
&POL\cr\n
&stb\cr\n
Service Request receive SRQ\n &SRQ\cr\n
Device Clear send
receive (DCL complete)
DCL\n
DCL\n
&DCL\cr\n
&DCL\cr\n
\n = newline, CHR$(10)
\cr = carriage return, CHR$(13)
For each socket two ports are defined for communication between instrument and con-
troller. They are called "Data Port" and "Control Port". The ports are used as follows:
●
"Raw" mode uses only the "Data Port". This mode provides the best performance.
●
"IEEE1174" mode uses only the "Data Port", even for transfer of emulation codes.
This implies that the controller must listen for service requests and emulation code
responses at the data port.
●
"Agilent" mode supports both "Data Port" and "Control Port". The setup of a second
connection via the control port is optional and recommended. It can be used for
transfer of emulation codes. Alternatively only one connection can be set up via the
"Data Port" and used for all messages.
Refer to the Remote Settings of the "Setup" menu for related instrument settings.
7.1.3 GPIB Bus Interface
The instrument can be equipped with one or two GPIB bus (IEC/IEEE bus) interfaces
which are available as options R&S CMW-B612A and R&S CMW-B612B, respectively.
The two interface connectors labeled "IEEE 488 CH 1" and "IEEE 488 CH 2" are located
on the rear panel of the instrument.
● The "IEEE 488 CH 1" connector is intended for remote control of the R&S CMW500
from a controller.
●
The "IEEE 488 CH 2" can also be used to control further devices from the
R&S CMW500.
In order to be compliant with EMC regulations open IEEE cables should be avoided. IEEE
cables have to be connected on both sides.
Characteristics of the interface
●
8-bit parallel data transfer
●
Bidirectional data transfer
●
Three-line handshake
●
High data transfer rate of max. 1 MByte/s
Interfaces and Connectors