INFICON MDC-260 Thin Film Deposition Controller - Manual (Page 146)

MDC-260 DEPOSITION CONTROLLER
COMPUTER INTERFACE 11-8
are decimal values stored as integers. To convert these values to their decimal
equivalent, use the following equation:
Decimal Value = (Integer Value)/(10*DP)
where DP is the value’s decimal point position. The decimal point positions for
all the parameters are constant and are given in tables along with the parameters’
range.
11.5 TRANSMISSION RECEIPT
Immediately after receiving a complete message, the MDC-260 will transmit a
short “Transmission Receipt” to the host computer. It indicates:
• That a message was received (specified by the “Message Received” Code
= 253)
• Which controller received the message (specified by its USB Interface
Address)
• What instruction code was received (specified by the Instruction Code)
• The outcome of the transmission (specified by the Receive Code)
The transmission receipt has the following format, shown in decimal and
hexadecimal:
Header Interface
Address
“Message
Received”
Length Instruction
Code
Receive
Code
Checksum
Dec 255 254 (1–32) 253 2 (0–40) (0–8) (0–255)
Hex FF FE (01–20) FD 02 (00–28) (00–08) (00–FF)
The following table shows a list of possible Receive Codes:
Receive Code Description
0 Message Received O.K.
1 Invalid Checksum
2 Invalid Instruction Code
3 Invalid Message Length
4 Parameter(s) Out of Range
5 Invalid Message
6 Process Undefined – Can’t Add Layer
7 Insufficient Layer Space - Can’t Add Layer
11.6 TRANSMITTING AND RECEIVEING MESSAGES
Whenever the MDC-260 receives a message, it will automatically send a receipt
that confirms it received the message, as described above. If the message
instructs the controller to take action or contains data to program the controller
with, the appropriate action is taken immediately. If the message instructs the