INFICON Guardian EIES Controller - Manual (Page 149)

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Guardian Co-Deposition Controller Operating Manual
private static byte crcHigh(short crc) {
byte val = (byte) (((crc >> 7) & 0x7f) + 34);
return val;
}
private static byte crcLow(short crc) {
byte val = (byte) ((crc & 0x7f) + 34);
return val;
}
public static byte[] pack(String str) {
int cursor = 0;
byte[] cmd = null;
str += " ";
cmd = new byte[str.length() + 5];
cmd[cursor++] = (byte) '!';
cmd[cursor++] = (byte) (34 + str.length() + 1);
char[] chrs = str.toCharArray();
for (int ix = 0; ix < str.length(); ix++) {
cmd[cursor++] = (byte) chrs[ix];
}
if (useCheckSum) {
short crc = calcCRC(cmd);
cmd[cursor++] = (byte) crcLow(crc);
cmd[cursor++] = (byte) crcHigh(crc);
} else {
cmd[cursor++] = (byte) 0;
cmd[cursor++] = (byte) 0;
}
cmd[cursor++] = (byte) 0x0a /* LF */;
return cmd;
}
public static String unpack(String msg) {
String str = null;
if (msg != null && msg.length() > 4) {
str = msg.substring(3, msg.length() - 2);
}
return str;
}
}
A small utility program, MessageGen, is available to illustrate proper message
generation. A typical complete command/response string is illustrated in the @
command below.