Siemens SIMATIC TIWAY 1 - Manual (Page 108)

HOST COMMAND SET REFERENCE
UNILINK HOST ADAPTER 5–23
USER MANUAL
Option–02 = The maximum allowable delay between the assertion of the
RTS signal and the activation of the CTS signal by the network
modem. The delay is specified in milliseconds ranging from 0 to
1000 (0000 hex to 03E8 hex) in increments of 1 ms. This
parameter is only used for RS–232–C/RS–423–A media and will
default to 1000 ms or 1 second. The REPORT HIU
CONFIGURATION command will return 0000 hex for this
parameter when using Local Line media.
The default value of 1,000 ms was defined to allow operation with
a wide variety of modems, but cause the network operation to be
very slow. You can improve the performance of your network by
tuning the value of this parameter. Most typical modems will
work properly with a delay of 15 ms. You can start at this value
and either increment or decrement it until the circuit functions
properly.
Option–03 = The number of milliseconds to delay transmission 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 this option when using Local Line media.