User Manual

Remote Command Format

Serial input to the instrument is buffered in an input queue which is filled, under interrupt, in a

manner transparent to all other instrument operations. The instrument will send XOFF when the

queue is nearly full; XON will be subsequently be sent when sufficient space becomes available

for more data to be received. This queue contains raw (un−parsed) data which is taken, by the

parser, as required. Commands (and queries) are executed in order and the parser will not start a

new command until any previous command or query is complete. Responses to commands or

queries are sent immediately; there is no output queue.

Commands must be sent as specified in the commands list and must be terminated with the

command terminator code 0AH (Line Feed, LF). Commands may be sent in groups with

individual commands separated from each other by the code 3BH (;). The group must be

terminated with command terminator 0AH (Line Feed, LF).

Responses from the instrument to the controller are sent as specified in the commands list. Each

response is terminated by the

<RESPONSE MESSAGE TERMINATOR> 0DH (Carriage Return, CR)

followed by 0AH (Line Feed, LF).

<WHITE SPACE> is defined as character codes 00H to 20H inclusive with the exception of the LF

character (0AH).

<WHITE SPACE> is ignored except in command identifiers. e.g. '*I DN?' is not

equivalent to '*IDN?'. The high bit of all characters is ignored. The commands are case

insensitive.

Each query produces a specific

<RESPONSE MESSAGE> which is listed with the command in the

remote commands list.

Command List

This section lists all commands and queries implemented in this instrument. The commands of

the TF830, all of which have been implemented on this instrument, are identified by “TF830” on

the right-hand side of the Remote Command Summary list (next section).

Each command is completely executed before the next command is started.

The following nomenclature is used:

<rmt>

<n> A single digit number.

<nr1> An integer number.

Function Selection

F<n>

Sets the measurement function to <n>, where n corresponds to the following:

0 B Input Period

1 A Input Period

2 A Input Frequency

3 B Input Frequency

Frequency Ratio B:A

5 A Input Width High

6 A Input Width Low

7 A Input Count

A Input Ratio H:L

9 A Input Duty Cycle

The new function is selected immediately and a new measurement is started.