Operator`s manual

SECTION 12. PROGRAM CONTROL INSTRUCTIONS
12-7
When either the DC112 or RF modem options
are specified, the time limit on the call (without a
correct response) specified in Parameter 3 is
timed from the start of the instruction and must
include the dialing time.
If the correct response is not received within the
time specified in Parameter 3, the 21X will
continue to make calls. The 21X will repeat the
calls at the fast interval specified by Parameter 4
for the number of retries specified in Parameter
5, after which the calls will be attempted at the
slow interval specified in Parameter 6.
Parameter 4 and 6 are timed from the start of
the Instruction. The actual delay between
retries for both the fast and slow attempts has a
random factor built in, which is added as an
offset to the delay specified. The random factor
prevents calls from different stations from
occurring at the same time. This offset will
range between 0 and one half of the delay
specified. The resolution of the timer for these
delays is the execution interval of the table in
which the alarm call is initiated.
Parameter 2 specifies which user flag (1-8) is to
be used as the interrupt disable flag. If this flag
is set high, Instruction 97 will not initiate an
alarm call. If the 21X is in the process of trying
to get through with an alarm call, setting the
interrupt disable flag high will abort further
attempts. Instruction 97 sets this flag high when
an alarm call has received the correct response.
Instruction 97 does not set the flag low; the flag
will remain high until set low by the program or
external command. When the flag is set low,
Instruction 97 is reinitialized.
Instruction 97 is unique in having a variable
number of parameters. Parameter 9 is the
number of stations, if any, in a RF link to the
base station. A non-zero entry (N) for
Parameter 9 will result in N parameters,
numbered 10 to N+9, in which the RF station
IDs are keyed. The RF station IDs are the IDs
of the RF Modems in the path from the initiating
datalogger to the base station. This excludes
the ID of the initiating datalogger's RF Modem.
Parameter 10+N (10 if 0 RF stations are
specified) is the number of digits, if any, in the
phone number. There are then as many
additional parameters as the number of digits
entered. The phone number is entered 1 digit
per parameter.
If the call is to go through a RF link to a phone,
then the RF Modem is specified in Parameter 1.
A RF Modem must be used between the DC95
and the phone line. See the PC208 manual for
additional interfacing notes.
When the DC112 Modem (Hayes compatible
commands) is specified, the following
commands are sent to the modem before the
phone number: ATV0, ATS7=180, and ATDT.
The first command causes the modem to
respond with digits rather than words. The
second command causes the modem to wait for
the carrier 180 seconds after calling or
answering. The third command causes the
Hayes to dial the number that follows the
command in "Touch Tones". The 21X will not
accept the line feed found in some Hayes
"compatible" modems.
PAR. DATA
NO. TYPE DESCRIPTION
01: 2 Modem option and baud rate
code. The left digit specifies the
modem being used and the
right, the baud rate.
Modem Baud Rate
0 - RF Modem 0 - 300
1 - Direct 1 - 1200
2 - DC112 2 - 9600
3 -76,800
02: 2 Interrupt disable flag (0-8)
03: 4 Time limit on call, 1 sec. units
04: 4 Delay between fast retries, 1
sec. units
05: 2 Number of retries at fast rate
06: 4 Delay between slow retries, 1
min. units
07: 4 Input location to store no. of tries
08: 4 ID to send
09: 2 Number of RF Stations (N)
10 to
N+9: 4 Station IDs
10+N: 2 Number of Digits (D)in phone
number
N+11 to D+N
+10 2 Telephone number by single
digits