ADLINK HSL-4XMO - Manual (Page 42)

32 Operation Theory
4.3 Command Delivering Time
HSL-4XMO supports both full duplex and half duplex mode. In full
duplex mode, one module occupies 4 HSL slave IDs by two ID
number steps. For example, if the module start ID=1, then it occu-
pies ID 1, 3, 5, 7. If having two slave modules, we suggest that the
second ID can be set at 2. Then, the second module would occupy
ID 2, 4, 6, 8.
In half duplex mode, the module occupies 4 HSL slave IDs by one
ID number step. For example, if the module start ID=1, then it
occupies ID 1, 2, 3, 4. If having two slave modules, we suggest
that the second ID can be set at 5. Then, the seoncd module occu-
pies ID 5, 6, 7, 8.
Host command on PC is transferring via HSL protocol. The base
time for one ID at 6Mbps data transder rate is 30us. The more IDs
exist in HSL system, the more scan time is needed. For example,
one HSL-4XMO module occupies 4 IDs at full duplex mode. The
total scan (cycle) time would be 7 times base time (30.4us × 8).
Because it occupies ID1, 3, 5, and 7, it need time to scan from ID1
to ID7. Consequently, it would take 243.2 us.
The following figures show the timing of single command.