Videotec sm328a, Operating Instructions Manual, Page: 33 / 344

4.3.1.5 Baud rate and data format
The baud rate is the same as the one set by the DIP switch for communications with the keyboards. Its
format is 8,N,2.
4.3.1.6 Example of a program
The following is a simple test program in BASIC, which can be used as a guide when creating more
complex control systems.
The program makes use of serial port COM1 with baud rate 9600.
OPEN "COM1:9600,n,8,2,bin,rb1000,ds0,cs0,cd0,rs" FOR RANDOM AS #1
COM(1) ON
ON COM(1) GOSUB Received ' when receiving goto Received
DO WHILE (1)
A$ = UCASE$(INKEY$)
' check keys to exit
SELECT CASE A$
CASE "1": ' switch camera 1 on monitor 1
PRINT #1, "[VA0PC1VidS1,1B]";
CASE "2": ' switch camera 2 on monitor 1
PRINT #1, "[VA0PC1VidS1,2C]";
CASE "S": ' automatic sequence on monitor no.1
PRINT #1, "[VA0PC1VidA1U]";
CASE CHR(27): ' exit from program with Escape
END
END SELECT
LOOP
Received:
DO WHILE NOT(EOF(1))
B$ = INPUT$(1,1)
IF B$ = "[" THEN PRINT
PRINT B$;
' print the characters received on the serial channel
LOOP
RETURN
4.3.2 Command list
The following is a list of commands for remote control of the matrix. The list includes the switching
commands and a number of commands for reading matrix status.
4.3.2.1 Acknowledge
The matrix responds in three ways:
•
it transmits
[ok]
on receiving a command for immediate action without asking for the status
•
it transmits a value if a parameter status is asked for
•
it transmits [err] if there is an error (parameters outside the allowed range or checksum error).
4.3.2.2 Typographical conventions
The PC message has a fixed heading ( VA0PC1) and is indicated below by the symbol # ; the checksum is
indicated by $ . For example, [ # Clr+ n$ ] with n=1 represents the command [VA1W] .
In the matrix responses described in the following table the space (blank ASCII 32) is represented by _
•
4. Advanced Functions Page 29/66 MNVCSM328A_1511_EN