Setting The Inputioutput Message Terminator Switch - Tektronix DC 5010 Anleitung

SET
I
SET
LOGIC LOGIC
0 1 1
EOI ONLY
=
0
I
I
1 - 1
1
I
LF/EOI
=
1
PRIMARY
ADDRESS
BINARY
WEIGHT
Push: left side for logic
0,
right side for logic
1.
Fig. 5-9. Bus address and message terminator switches.
The address byte sent by the controller is actually eight
bits wide. Bits 5 through 1 are for the primary address set
according to Table 5-2, while bits 7 and 6 determine whether
the byte is a listen address (32
+
primary address) or a talk
address (64
+
primary address). Secondary address bytes
(where bits 7 and 6 are both a logical 1) are not used by the
DC 501 0, so they are ignored.
Before power-up; set switches A5 through A1 as de-
sired. Do not set primary address 0 when using
TEKTRONIX 4050-Series controllers. They reserve primary
address 0 for themselves. Setting the primary address to 31
logically removes the DC 501 0 from the GPIB. It does not
respond to any GPIB addresses or commands and remains
both unlistened (UNL) and untalked (UNT).
Setting the InputlOutput Message Terminator
Switch
The top switch (number I ) , illustrated in Fig. 5-9, is used
to select the terminator of messages on the bus. If LF/EOI is
selected, the DC 5010 interprets either the line feed (LF)
character or the assertion of EOI concurrently with a data
byte as the end of an input message string. If EOI ONLY is
selected, the DC 501 0 interprets the byte sent with EOI as-
serted as the end of an input message string.
Table 5-2
IEEE 488 (GPIB)
PRIMARY ADDRESSES
Switches
Primary
A5 A4 A3 A2 A1 Address
This switch also selects the output message terminator
from the DC 5010. If set to LFIEOI, the DC 5010 adds the
carriage return (CR) and line feed (LF) characters, with EOI
asserted along with LF, after the last byte in the output
message string. If set to EOI ONLY, the DC 5010 asserts
EOI concurrently with the last byte of the output message
string.