EZT-550 Controller Manual
55
9.2.1 Write Data Command
Data can be written to multiple operands at a time starting with the specified operand in the EZT-550. This
command can be used to turn the chamber on and off as well as set setpoints and start/stop a profile.
Request Message (Write Data Command)
NOTES:
(2)
Communication device number is always 00 (30h 30h).
(5)
Data type designation is D (44h).
(6)
See Section 9.3 for operand designations.
(8)
Data length varies upon number of operands written. Each operand consists of 2 bytes.
(9)
See Section 9.2.3 for BCC calculation.
Data Format in the Request Message (Write Data Command)
In order to properly insert the required fields into the request message, the values must be properly converted
into ASCII codes. In the following example, a decimal data value of 40966 is to be written to an operand in the
EZT-550.
Bit 15 Bit 0
The value consists of two bytes, upper and lower. First, convert the decimal value into hexadecimal and then
convert the hexadecimal value into ASCII codes. Upon conversion A024 will result in 4 bytes of data (41h 30h
32h 34h) in the request message. Consequently, the data length to write in this example is 16bits, or 2 (02h)
bytes, so include ASCII codes 30h 32h in the request message for the data length.
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