ESA VT130W, Руководство по оборудованию, Страница: 850 / 976

CHAPTER 38
Data exchange area
405.1200.037.2 - Rel.: 2.21 of 25/02/2008
38-44
The recipe code in the VT must be 4 characters long
You are advised to use this command associated with command 48
(valid for VT575W, VT580W, VT585WB, VT595W) otherwise the
recipes will be lost when the VT is switched off.
COMMAND 20: Synchronization of recipe transfer
Word Value/Meaning
0
20
Makes it possible to tell the device that a recipe transfer is to start.
The device must respond to the VT before transmission can begin.
1
Bit commands
Contains the response bits to the RECIPE STATUS AREA
13 TIMEOUT confirms to the VT timeout of transmission
14 ENDTX confirms to the VT end of transmission
15 STARTTX confirms to the VT beginning of transmission
2 Not used
3 Not used
COMMAND 21: Request for a recipe
Word Value/Meaning
0
21
Sends the VT request to transfer a recipe to its memory.
Parameters 1 and 2 contain the 4-character code (name) of the recipe.
Logic state “0” of bit 4 of VT STATUS word (in VT STATUS AREA) indicates that the code requested is
present in the data memory of the VT, while logic state “1” indicates the absence of the code.
With the code present transmission starts in SYNCHRONIZED or UNSYNCHRONIZED mode as deter-
mined by the project.
1 Character 1 Character 2
2 Character 3 Character 4
3 Not Used
COMMAND 22: Sends recipe to VT without overwriting
Word Value/Meaning
0
22
Makes it possible to send the VT a recipe with a new code for it to be saved in the data memory only if
code is absent.
Parameters 1 and 2 contain the 4-character code (name) of the recipe.
Logic state “0” of bit 4 of VT STATUS word (in VT STATUS AREA) indicates that the code requested is
present in the data memory of the VT, while logic state “1” indicates the absence of the code.
With the code absent the VT starts transmitting and then saving the data.
1 Character 1 Character 2
2 Character 3 Character 4
3 Not Used
VT Video
Buffer
Device
VT Data
Memory