Communication Phases; Synchronization; Data Exchange; Table 51 Commands - WAGO 750 Product Manual

750-1632/000-100

8.2.3 Communication Phases

The Mailbox 2.0 mechanism defines the following two communication phases:

• Synchronization

• Data Exchange

Only after successful synchronization from sender to receiver can the actual user data be
exchanged.
8.2.4 Synchronization
In the synchronization phase, the handshake byte is used in Control mode. A distinction
is made between interpretation as signaling mode and interpretation as command ac-
knowledgment mode.
In command acknowledgment mode, the handshake byte appears as follows:
Bit 3
0
The Control nibble is used to transfer a request while the Status nibble contains the re-
sponse to the request.
Mailbox 2.0 Commands
The following commands are defined:
Value
0
1
2
3 ... 7
Acknowledgment
The following acknowledgments are defined:
Value
0
1
2
3 ... 7
Product manual | Version: 1.1.0
Proportional Valve Module 2-3-4
Status Nibble
Bit 2 Bit 1 Bit 0
Acknowledgment
Explanation
INVALID
HOLD REQUEST
RESET REQUEST
–
Explanation
INVALID
HOLD ACKNOWLEDGE
RESET ACKNOWLEDGE
–
Control Nibble
Bit 3 Bit 2
0 Acknowledgment
Description
Signaling that the sender has not
yet resumed operation after a reset
Notice that the channel is ready, but
data is not currently being trans-
ferred (e.g., because the send buf-
fer is still empty)
Prompt to reset
(not supported, ignore)
Table 52: Acknowledgments
Description
Signaling that the receiver has not
yet resumed operation after a reset
Signaling or confirmation that the
channel is ready, but data is not
currently being transferred (e.g., be-
cause there is not any data yet).
Response to "RESET REQUEST"
when Mailbox 2.0 in reset.
(not supported, ignore)
Appendix
Bit 1 Bit 0
Table 51: Commands
79