Campbell Scientific PC208 Datalogger Support Software - Manual (Page 81)

SECTION 5. TELCOM
5-7
If TELCOM is used in the attended mode, the
parameters dealing with call intervals and the
next time to call are not used. Enter the station
names with the /C option and disregard the next
time to call.
COM PORT
Options: COM1
COM2
COM3
COM4
TELCOM will allow you to use either COM1,
COM2, COM3, or COM4 in communicating with
a station.
Different ports can be used for different
stations. Usually there will be a modem of
some type connected to the COM port used, so
your designation of a COM port only identifies
which PC port is to be used. Whichever COM
port is used must be set up to look like a
standard IBM Serial Asynchronous
Communications Adapter which will allow the
use of interrupts for receiving characters.
When TELCOM is exited, the COM Port and its
interrupt are completely disabled. Subsequent
programs must reinitialize the Port before using
it (e.g., if the Port is used for a serial printer, the
DOS MODE command must be issued before
the PRINT command will address the COM
Port).
Baud Rate:
Baud rate is restricted to what the datalogger or
modem will support. This must match the
modem and datalogger used. TELCOM will
support 300, [600], 1200, [2400], [4800], and
9600 baud.
Interface Devices:
Options: End
SC32A
Hayes modem
Number:
RF Modem Path:
MD9 Address:
RAD Modem
SC95 Short Haul
Generic Modem
Number:
The prompts for the telephone "Number", MD9
"Address", or RF Modem "Path" will not appear
until the interface device is selected. It is
possible to go through more than one of these
devices to get to a datalogger. The devices are
entered in order from the computer to the
datalogger. For example, you may have a
Hayes Smartmodem connected to a phone line
which calls a RF base station and accesses
several dataloggers via RF. The Smartmodem
would be selected first, followed by the RF
Modem with the path to the particular
datalogger. TELCOM will allow up to 4
interface devices between the PC and the
datalogger. The number actually used is limited
more than that by the nature of the devices. For
example, you can access a RF network via
phone modem, but you cannot via Short Haul
Modem. After you have specified the last
device you are using, select "End".
TELCOM calculates how long it needs to wait for
a response from the datalogger, based on the
number and type of interfaces in the link. There
are several cases in which the default calculation
will not allow enough time. Some of these are: a
telephone link that uses a satellite repeater (e.g.,
calling Alaska from continental U.S.), a cellular
telephone modem link, or a RF network that
uses a translator repeater (contact Campbell
Scientific prior to attempting this). The length of
time TELCOM waits can be extended by
entering '+nnn' at the end of the phone number
or RF path; nnn is a number in hundredths of
seconds (e.g., +100 adds 1 second).
When the Hayes Modem or Campbell
Scientific's DC112 Modem is used, it may be
necessary to include some commands to the
Hayes with the phone number. Depending on
the first character entered TELCOM will
automatically send a set up string to the
modem. If the first character of the user
entered phone number is:
phone digit - TELCOM sends "ATDT" +
phone number
; - TELCOM sends "AT" +
phone number without the ";"
P or T - TELCOM sends "ATD" +
phone number
all other - TELCOM sends "AT" +
phone number
Modem commands can be included with the
phone number to alter default settings. For
example: 'S7=60 DT' preceding the phone