Samsung Ht As700 User Manual

111
Structure of Communication Frames
The function code is explained with the example of Query and 
Response frame based on the 2-step communication.
Query (Q) and Response (R) frame
Query Acknowledge (QA) frame
Response Request (RR) frame
Response (R) frame for an errorDA SA Function code Length Information CRC L CRC H
Length of information area 
(byte)
1 to 255: 1 to 255 bytes
0: 256 bytes
Function code
Sender ID
Receiver ID
DA SA $80 01 00 CRC L CRC H
DA SA $00 01 00 CRC L CRC H
DA SA $8X 01 Error No...

112
Read the content of the bits (R, L, M, K, F, or TC) assigned to the absolute address.
Can read n consecutive bits (On/Off).
Query (Q) frame
Response (R) frameDA SA $21 $03BAS
L      HNCRC
L      H
DA SA $A1 NBase + 0
bit valueBase + 1
bit value-Base + N-1
bit valueCRC
L     H
Length of information (byte) 
Peripheral device ID (PC ID)
Bits that are On are represented by the one byte value $FF. 
Bits that are Off have a value of $00.
Absolute bit address (address of 
first bit to read)
Refer to 3.3...

113
Modify the contents of the bits stored in the absolute address (R, L, M, K, F, or TC).
Change the bit state between On/Off.
Can change multiple consecutive bytes. 
Query (Q) frame
Response (R) frame
Read the content of the words (R, L, M, K, F, or W) assigned to the absolute address.
Can read n consecutive words. 
Query (Q) frame
Response (R) frameDA SA $22 N
Base
L       HBase+0
bit valueBase+N+1
bit value-Base+N-3bit 
valueCRC
L       H
DA SA $A2 &01
&00CRC
L       H
DA SA $23 $30Base
L...

114
Change the content of the words (R, L, M, K, F, or W) assigned to the absolute address.
Can read n consecutive words. 
Query (Q) frame
Response (R) frame
Read the bits and/or word contents of the assigned absolute addresses.
Can read bits and words regardless of their order and location in memory. 
Query (Q) frame
Response (R) frameDA SA $24 L
Base
L       HBase+0word
L       H-Base+1word
L       HCRC
L       H
DA SA $A2 $01
&00CRC
L       H
DA SA $25 LAO
L       HA1
L       H-An
L       HCRC
L...

115
Read the bits and/or word contents of the assigned absolute addresses.
Can read bits and words regardless of their order and location in memory.
Query (Q) frame
If Ax denotes a bit address, the Dx data is 1 byte (On=$FF, Off=$00), and 
if Ax denotes a word address, the Dx is 1 word (2 bytes). 
Response (R) frameDA SA $26 L
AO
L       HDOA1
L       H-CRC
L       H
DA SA $A2 $01
$00CRC
L       H
Method of assigning bit/word
absolute address
   
15  14  13                                     0
   0...

116
Communication Program Examples
Users can write a communication program by using the following 
example. For more information, contact the sales or technical 
department.
ProgramNotes

#include 
#include 
#include 
#define PC_ID 0xE2
#define time_limit 28
#define retrial_limit 2
#define TRUE 1
#define FALSE 0
#define lower_byte(x) (unsigned int) ((x)& 0x00FF)
#define upper_byte (x) (unsigned int) (((x)& 0xFF00)>>8)
typedef int BOOL;
unsigned int PORTADD,DIVISOR,sending_delay, receiving_delay;
unsigned...

117
ProgramNotes
* Initialization of GPC card */
if(port_number == 1) PORTADD=0x3F0;
if(port_number == 2) PORTADD=0x2F0;
if ((port_number >= 3) && (port_number 1)^0xA001; /* 0x0001 :  
    multi-nominal expression */
    else Crc=Crc>>1;
    }
    }GPC-300 card Setting (8255chip setting) 
Uses the communication card that is connected, and sets the environment 
according to the PLC communication specifications, so that 
communication is possible.
 
CPU-ID: Input PLC ID (0 to 255) 
Reads the register value...

118
ProgramNotes
void Job(void)
    {
    /* JobID=0  : Change to sending-mode for serial port */
    /* JobID=1  : Transmit sending-frame                 */
    /* JobID=2  : Change to receiving-mode for serial port */
    /* JobID=3  : Address polling of ACK from CPU   */
    /* JobID=4  : Receive ACK from CPU              */
    /* JobID=5  : Change to sending-mode for serial port */
    /* JobID=6  : Transmit RR-Frame                 */
    /* JobID=7  : Change to receiving-mode for serial port */...

119
ProgramNotes
   break;
   case 4:
   case 9:if(receiving_occuring())
   {
   if(indexTime_limit)
    {
    watchdog=0; retrialC--;
    JobID=(JobID & 0x05);
    }
    if(!(((Old^New) & 0x02)==0))
    {
    watchdog=watchdog+1;
    Old=New;
    }
    }while((retrialC!=0) && (Success==FALSE));
    if(retrialC==0) ret=1;
    else ret=0;
    return(ret);
    }
void Mword_reading(void)
    {
    /* Example of Read-Register */
    int  i;
    receiving_frame[2]=3;/* EXAMPLE READ WORD(M000-M0127) */...

120
ProgramNotes
 if(communication() == 0) printf(WRITE K0000-K0063 OK\n);
    else printf(communication error\n);
    receiving_frame[2]=4;            /* EXAMPLE write WORD(K064-K0127) */
    receiving_frame[3]=130;        /* Number Of Byte For Information */
    receiving_frame[4]=0x80;      /* BASE(K000=$0180) LOW */
    receiving_frame[5]=1;             /* BASE HIGH  */
    for(i=0;i