Communication Phases; Synchronization; 10.1.3.1.1 Mailbox Commands; Table 29: Commands - WAGO -I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-658 CAN Gateway
10.1.3

Communication Phases

The Mailbox 2.0 mechanism defines two communication phases:
•

Synchronization

• Data exchange
Only after successful synchronization from sender to receiver the actual user data
can be exchanged.
10.1.3.1 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 acknowledgement mode.
In command acknowledgement mode, the handshake byte appears as follows:
Status Nibble
Bit 3
0
The Control nibble is used to transfer a request while the Status nibble contains
the response to the request.

10.1.3.1.1 Mailbox Commands

The following commands are defined:

Table 29: Commands

Value Explanation
0 INVALID
1 HOLD REQUEST
2 RESET REQUEST
3 ... 7 -
Manual
Version 1.2.0, valid from FW/HW-Version 01/01
Bit 2 Bit 1 Bit 0
Acknowledgement
Control Nibble
Bit 3 Bit 2 Bit 1
0 Command
Description
Signals that the sender has not started operations again after a
reset.
Notice that the channel is ready, but data is not currently
being transferred
(e.g. because the output buffer is still empty)
Prompt to reset
(not supported, ignore)
Appendix
Bit 0
75