Dataplex DPX-213, User Manual

Page: 74 / 93

S REGISTERS
Section 8
8-8
Copyright (C) Dataplex Pty Ltd
S32 Modem Flow Control Xoff Character
Default : 19 decimal (###
s
13 HEX)
Range : 0 to 255 (Stored in NVRAM)
Stores the ASCII 8-bit value of the modem (AT&K) flow control X-off character.
S33 Modem Flow Control Xon Character
Default : 17 decimal (###
q
- 11 HEX)
Range : 0 to 255 (Stored in NVRAM)
Stores the ASCII 8-bit value of the modem (AT&K) flow control X-on character.
S36 &
S37 Inactivity Timer Duration
Default : 0 Decimal
Range : 0 to 65535 Seconds (Stored in NVRAM)
This register pair (high byte and low byte) contain the timer duration for line or DTE
inactivity. The value placed in these S registers is used to determine if the modem has been
inactive for a given period of time and subsequently causes the modem to disconnect the
call. To calculate registers S36 and S37, use the following equations:
S37 = (Inactivity Timer Duration divided by 256) -
Whole Number Only
S36 = Remainder of above equation.
For example, setting the inactivity timer duration to 1 minute and 30 seconds (or 90
seconds) would involve setting register S37 to 0 (as 90 divided by 256 yields 0) and setting
register S36 to 90 (as the remainder of the previous equation is 90). In other words, when
the duration of the inactivity timer is less than 256 then S37 will be 0 and S36 will be the
duration. Alternatively, setting the inactivity timer duration to 5 minutes (300 seconds)
would involve setting register S37 to 1 (as 300 divided by 256 yields 1) and setting register
S36 to 44 (as the remainder of the previous equation is 44). In other words, when the
duration of the inactivity timer is greater than 256, then S37 will store the multiples of 256
and S36 the remainder.
If the inactivity timer is employed, the modem will attempt to go into the low
power/standby mode (provided the modem is left off-line in the command state for greater
than the inactivity period). The actual time in seconds is ((256 x S-Register S37) + S-
Register S36).