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7.10
SINGLE BYTE COMMANDS
7.10.1
General
Single byte commands are commands in which all the necessary data for the supply to act upon is
contained in a single byte. Single byte commands will be executed immed
i
ately by the supply. If the
command require
s data to be sent to the HOST PC or IEEE Board (see se
c
tions 7.10.4 and 7.10.3.1)
that response will be transmitted immediately with no delay due to any software overhead. With the
exception of the Disconnect from communications command, section 7.10.3.1,
commands must be
sent by the HOST PC or IEEE Board 2 times in s
e
quence for verification. All
have the most significant
bit, D7, set to a logic 1. A CR, carriage r
e
turn, character is not included in a single byte command.
The RST command will not change any
setting made by a single byte command.
All Single Byte commands will be executed in 1 ms or less. This does not include any r
e
sponse sent
to the HOST/IEEE Board, which is dependent upon the response length and the serial transmission
speed (Baud rate).
7.
10.2
Global commands without response
7.10.2.1
Disable MD Mode (MD MODE OPTION REQUIRED)
Disable is the default condition upon power up. The Hex value of the command is 0xA0. Send it two
times in sequence. All supplies, both the currently addressed suppl
y and all non
-
addressed su
p
plies,
will disable MD Mode as a result of this command.
7.10.2.2
Enable MD Mode (MD MODE OPTION REQUIRED)
Send to enable Multi Drop Mode. The Hex va
lue of the command is 0xA1. Send
it two times in s
e-
quence. When this command is
sent, the supply will set SRQ retransmission to the disable state; if
you wish it to be enabled you must send the enable command. All supplies, both the currently a
d-
dressed supply and all non
-
addressed supplies, will enable MD Mode as a result of this com
mand.
7.10.2.3
Disable SRQ retransmission (MD MODE OPTION REQUIRED)
Disable is the default condition upon power up. The Hex va
lue of the command is 0xA2. Send
it two
times in sequence. If the supply sends an SRQ it will only sent it 1 time. All supplies,
both the cu
r-
rently addressed supply and all non
-
addressed supplies, will disable SRQ retransmission as a result
of this command. All status registers will retain their data when this command is sent.
7.10.2.4
Enable SRQ retransmission (MD MODE OPTION REQU
IRED)
Enable retransmission of SRQs. This is only available when the Multi Drop Mode is enabled in the
supply. The Hex value of the command is 0xA3. Send it two times in s
e
quence. If the supply sends an
SRQ it will be repeated on a timely basis, 10 ms plus
20 ms times the supply address, until answered.
All supplies, both the currently addressed supply and all non
-
addressed supplies, will enable SRQ r
e-
transmission as a result of this co
m
mand.
7.10.2.5
Enable FLT Bit in the SENA Register
The Hex value of th
e command is 0xA4. Send it two times in sequence.
7.10.3
Global commands with response
7.10.3.1
Disconnect from communications
Command the supply to end all data transmissions to the HOST PC/IEEE Board and cease its role as
the active addressed supply.
The HOST PC/IEEE Board will be required to re
-
send the ‘ADR nn’
command to reestablish communications with the supply. After r
e
ceiving the first command the supply
will respond with an OK<CR>. The Hex value of the co
m
mand is 0xBF. All supplies, both the cu
rrently