Command strings, Table 33. command characters – Grass Valley Performer-HD User Manual

Page 43

Performer-HD Instruction Manual

3-11

Serial Protocol Descriptions

Command Strings

Commands,

, must consist of exactly

char-

acters forming a string of zero or more commands. Each command must
consist of a single

character identifying the command, followed by

any

required by that command.

The following command characters and data are supported.

Except for the

command, all of the above are sent by the controller to the

Performer-HD. The

command is sent by Performer-HD to the controller

in response to a

(Query for status) command. Performer-HD generates a

response to the

command only.

The

command (Reset) causes Performer-HD to initialize just as if power

had been turned off, then on. No data should follow the

command.

The

command allows matrix crosspoints to be preset but not actually ac-

tivated. A subsequent

command causes preset values to take effect.

This can be useful when you wish to switch several switchers on a particu-
lar video field and thus have no time to send several messages. The

com-

mand is used to set up the switchers; then a series of short

commands to

each switcher initiates the switch.

The

and

commands both set all levels.

commands should be sent to

set the values of any level which are not to be the same as in the last

command (source 1 initially).

Table 3-3. Command Characters

Description

D (44H)

Data preset, source to destination

A (41H)

(None)

All-destination Take of current preset matrix

T (74H)

Take of specified destination only

P (50H)

Protect specified destination (must be refreshed every 30 seconds)

C(43H)

Clear protect on specified destination

R (52H)

(None)

Reset Performer-HD to factory defaults

Q (71H)

Query for status of specified destination

S (53H)

Status response