Instruction Manual

13
3.9 SETTING THE ALARM DEADBAND
XAD(a) <CR>
where a is the percentage (0-9)
Example:
Command :
XAD1 <CR>
Select a 1% deadband
Response:
XAD1 <CR> <LF>
Example: Loop 3 High Alarm Set - 1000 F
(J T/C) Low Alarm Set - 900 F
Deadband Percent - 1 %
High Alarm will clear at 990 F
Low Alarm will clear at 909 F
Example: Loop 8 High Alarm Set - 0900 (90% FS)
(Millivolt) Low Alarm Set - 0100 (10% FS)
Deadband Percent- 1 %
High Alarm will clear at 89.1% FS
Low Alarm will clear at 10.1% FS
3.10 HEXADECIMAL DATA FORMAT
For the fast read and write commands (Sections 3.7 and 3.8) a compressed hexadecimal
data format is used in which each ASCII character represents a value between 0 and 15
(0 thru F in hexadecimal).
Since it takes four binary bits to represent each of these hexadecimal characters (0-F),
each character can hold the status of a four line group of I/O Lines. If the bit is a "1" the
line is high (on). If the bit is a "0" the line is low (off). For the fast status read this
requires six characters to cover 22 lines and for the Fast Output Write command four
characters are required to handle 16 lines.