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NOTE
In the G2 and G3 prefix modes, EOI is transmitted
only at the end of the complete
program
memory
transmission;
not during the last byte of each IEEE
buffer or memory location.
12. Set Last Channel (L)
The letter L is the command
to program a specific channel
as the last channel. The last channel must be at least one
channel
ahead
of the first channel
otherwise,
the scan
sequence
will not operate
properly. For example,
if the first
channel
is programmed
to be five, then the last channel
must be specified
as at least six. The format for set last
channel command is as follows:
Lnnn
where
L = Set Last Channel Command
n = Number of Channel
Programming Example
-
Enter the following
statement
into
the HP-85 to set channel 10 as the last channel.
REMOTE 717 (END LINE)
OUTPUT 717; "LlOX" (END LINE)
When END LINE is pressed the second time, the Model 705 sets
channel IO as the last channel. To display channel IO and verify
it is programmed
as the last channel type the following statement
into the HP-85:
OUTPUT 717; "BIOX" (END LINE)
NOTE
The number of channels for a particular
configura-
tion is determined
by the number
of poles, and
Model 705 daisy chained together.
13. SRQ(M)
The letter M is the SRQ command
mode. The SRQ mode
controls which conditions within the instrument
generates an
SRQ (Service Request). Once an SRQ has been generated,
the status can be checked to determine
if the SRQ was gen-
erated by the Model 705. In addition, other bits in the status
byte are sent depending
on certain
data and error condi-
tions. For more information
concerning
the SRQ byte and
SRQ mask refer to paragraph
3.5.5.
14. Open Channel (N)
The letter N is the command to open a specific channel. The
format for the open channel command
is as follows:
Nnnn
where
N = Open Channel Command
n = Number of Channel
Programming Example
-
Enter the following
statements
into
the HP-85 to program the Model 705 to open channel 7.
REMOTE 717 (END LINE)
OUTPUT 717; "N7X" (END LINE)
When the END LINE is pressed the second time, the Model 705
opens channel 7. To display channel 7 and verify it is open type
the following statement
into the HP-85:
OUTPUT 717; "B7X" (END LINE)
NOTE
The number of channels
for a particular
configura-
tion is determined
by the number
of poles and
Model 705's daisy chained together.
15. I/O Port (0)
The letter 0 is the I/O port command.
It controls the status of
the eight output bits on the display I/O port on the rear panel
of the Model 705. The format for the I/O port command
is as
follows:
Onnn
where
0 = I/O Port Command
n = 0 to 377 Octal
Converting
the octal base of n to correspond
to base 2, eight
outputs for the digital I/O outputs is as follows:
nnn = nnnnnnnn
if 0, the bit is low.
(octal) binary) if 1, the bit is high.
Example:
077 = 00111111
(Octal) = (Binary)
The I/O port command consists of the ASCII 0 character fol-
lowed by the decimal number that sets the control bits. Upon
power-up, or after a DCL or SDC, the eight output lines are
set low. Table 3-10 lists the digital
I/O port contact
pin
assignments.
Figure 3-5 shows the contact
pin locations.
The maximum
current
draw from
the digital
I/O port is
350mA. This includes the relay card and the output. The cur-
rent limiting resistor is 68R.
NOTE*
The +5V on pins 1 and 2 of the digital I/O port is
current limited by the 680 resistor.
TOP SIDE OF
DIGITAL l/O BOARD
PIN i
(UNDERNEATH)
Figure 3-5. Digital I/O Port Pin Assignments
3-l 9
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