TDK 1500W, 750W 58, 7.10 SINGLE BYTE COMMANDS

507

013 Rev. D

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

tained in a single byte. Single byte commands will be executed immediately by the supply.I f the

mand 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

exce

tion 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 verif

cation. All 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 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 res

ponse 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 su

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 value of the command is 0xA1. Sent it two times in s

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 cu

rrently a

dressed supply and all non

addressed supplies, will enable MD Mode as a r

sult 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 cu

rently addressed supply and all non

addressed supplies, will disable SRQ retransmission as a result

of this command. All status registers will retain thei

r 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 Modeis enabled in the

supply. The Hex value of the command is 0xA3. Send it two times in sequen

ce. 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

transmission as a result of

this co

mand.

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.

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’ co

mand to reestablish communications with the supply. After receiving the first command the supply will

respond with an OK<CR>. The Hex val

ue of the command is 0xBF. All supplies, both the currently

addressed supply and all non

addressed supplies, will

respond to this command; but only the cu

rently a

dressed supply (if any) will respond with the ‘OK’.