Nikon NWL860 Series, Руководство пользователя

Страница: 15 / 96

12
Chapter 3 Interface Specification
2
3
4-6-3. R-Bit
Defines the direction of message transmission.
R = 0: Host (H)
→
Equipment (E)
R = 1: Host (H)
←
Equipment (E)
4-6-4. Message ID
Consists of 2 bytes; seven upper bits (stream code) + eight lower bits (function code).
See 4-6-6. for the stream code, and 4-6-7. For the function code.
4-6-5. W-Bit
Defines whether the message contains a request for a response.
W = 0: The transmitter does not expect a response.
W = 1: The transmitter expects a response.
4-6-6. Stream Code
Stream code represents the category of a message. Several code numbers are reserved by the
SECS.
Code
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
Equipment status
Equipment status and diagnosis
Status of the material
Control of the material
Exception report
Data gathering
Control of manufacturing program
Control program
System error
Terminal service
Message Type
4-6-7. Function Code
The Function code represents the specific message contained in a stream. Several code
numbers are reserved by the SECS.
① The code F0 is defined as an abort transaction for all stream codes.
②
During information exchange, the first message sent is always assigned an odd code
number, while the response to the message is assigned an even code number, determined by
incrementing the first message code number by one.
Stream Code 0–63: Reserved by the SECS.
64–127: Defined by the user.
Function Code 0–63: Reserved by the SECS.
64–255: Defined by the user.