varian dual controller (929-7008)

[xinding]

Anyone is using varian dual controller? I have difficult to change from "local" to "serial" following the manual. HV cannot be selected manually under serial model.

can you check my attached picture. Is the error message "107367294" indicating something wrong with the instrument setting?

Thanks.

[MCOTO]

Hey,

It looks like you forgot to attach the picture.

Regards,

MCOTO

[xinding]

see my attached Vi. ACK command, such as @04 A0 ? 0389 listed on page 59 in the manual. It does not seem reading anything.

Anyone can tell me more about ACK command? Thank you.

[MCOTO]

Hi,

The ACK (acknowledge) is a common method in communication protocols to let the sender know that a package (instruction or command) have been received successfully. This interaction between sender/receiver is known as Handshaking. There are two possible methods: by software (this is the one that your device is using. But is possible to use both) and by hardware (without interaction from the user). Take a look to the link below to the section What is Handshaking? for one example for the Serial protocol.

http://digital.ni.com/public.nsf/allkb/2AD81B9060162E708625678C006DFC62

Also notice that the ACK command will be sent by the device as a confirmation. You cannot write this command.

“ The write modes will have the following possible replies”

Regards,

MCOTO