83-507-5002 Rev. A
59
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 immediately by
the supply. If the command requires data to be sent to the HOST PC or IEEE Board (see
sections 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 sequence for verification. Alll have the most significant bit, D7, set to a logic 1. A
CR, carriage return, character is not included in a single byte command. The RST com-
mand 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 re-
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 supply
and all non-addressed supplies, 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 value of the command is 0xA1. Sent it two
times in sequence. When this command is sent, the supply will set SRQ retransmis-
sion to the disable state; if you wish it to be enabled you must send the enable com-
mand. All supplies, both the currently addressed supply and all non-addressed sup-
plies, will enable MD Mode as a result of this command.
7.10.2.3 Disable SRQ retransmission (MD MODE OPTION REQUIRED)
Disable is the default condition upon power up. The Hex value of the command is
0xA2. Sent it two times in sequence. If the supply sends an SRQ it will only sent it 1
time. All supplies, both the currently addressed supply and all non-addressed sup-
plies, 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 REQUIRED)
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
sequence. 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 ad-
dressed supply and all non-addressed supplies, will enable SRQ retransmission as a
result of this command.
7.10.2.5 Enable FLT Bit in the SENA Register
The Hex value of the command is 0xA4. Send it two times in sequence.
To Next Page
Loading...
