Siemens SIMATIC TIWAY 1 - Manual (Page 139)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–54
USER MANUAL
Option–04 = The number of milliseconds to delay transmission over
Channel A (Port 1) after the CTS signal becomes active. This
parameter is required for transmission over some radio links.
The delay is specified in milliseconds ranging from 0 to 1000
(0000 hex to 03E8 hex) in increments of 1 ms. This parameter will
default to 0 ms and will be reported as 0000 hex for Local Line
media. ERROR RESPONSE 0085 will be returned if a non-zero
value is specified for the option when using Local Line media.
Option–05 = The Channel B CTS delay, specified as described above.
Option–06 = This parameter defines the Channel A secondary turn around
time. This is the maximum time required by a secondary to
generate an HDLC response to a Network Manager HDLC
command. The value is specified in milliseconds and ranges from
1 to 5,000 (0001 hex to 1388 hex) This long turn around time is
required for system testing and defaults to 15 ms. This long
default enables the Standalone Network Manager to operate
with ITTs, since ITTs have a longer turnaround time than NIMs.
The overall secondary timeout will be calculated by the Network
Manager as the secondary turn around time plus the RTS/CTS
delay plus the character time plus the after CTS delay. Character
time is the time required to transmit eight bits of data at the
selected baud rate.
Option–07 = The Channel B secondary turn around time, specified as
described above.
Option–08 = 0001 – Enables the auto redundant media option. The NM will
automatically switch secondary devices from a failed channel to
the backup channel if redundant media is available.
0000 – Explicitly disables the auto redundant media option.
Option–08 is disabled by default.