Instruction manual
APPENDIX B. MODEMS
B-2 PC208W, Version 3.0, Instruction Manual
R“xx”nWait for response. This forces the
preceding portion of text to be sent, then waits
up to n millisecond for the quoted string xx to be
returned. When the last character of the quoted
string is received, the command is complete
and the command string continues with the next
command. If the quoted string is not received in
the allowed time, the PC208W dial attempt fails
and the command string is aborted.
NOTE: Only the order and existence of the
quoted string is checked. Other characters
may be mixed in the response and will be
accepted and ignored as long as the
specified characters come in the correct
order.
Spaces are allowed between commands and
quoted strings and will be ignored.
For example: “^m” D250 “^m” D250 “ATZ^m”
R“OK” 250 will send a carriage return, pause
250 milliseconds, send a carriage return, pause
250 milliseconds, send ATZ followed by a
carriage return, and then will wait 250
milliseconds for OK to be returned from the
modem.
B.3 MD9 MULTIDROP INTERFACE
PC208W uses MD9 dialing with the base MD9
ID (address) set to 255. Note that phone to
MD9 networks already have the base MD9
address set to 255 and do not need to be
changed. Addressing the base MD9 at 255
provides PC208W with a prompt from the base
MD9. This provides more reliable dialing and
better information about any problems that may
occur while dialing.
NOTES ON USING PC208 AND PC208W
Both PC208W and PC208 can be used to
communicate with the same datalogger. Data
collection will be independent. If an MD9
network is used, any station file used with
PC208E, GraphTerm or TELCOM will need to
be changed once the base MD9 address is
changed. To modify the .STN file for current
DOS versions of PC208, simply add a “#” to the
end of the MD9 dialing path.
For example, the device section of a station with
an MD9 addressed at 1 would change from:
Interface Device:
#1: MD9 Addr: 1
to:
Interface Device:
#1: MD9 Addr: 1 #
B.4 SHORT HAUL MODEMS
Newer short haul modems (SRM5) are
configured as if the datalogger were operating
under a direct connection. The datalogger is
added directly to the COM port in the device
map, with no other devices between the two.
Older short haul modems (SC95) require a
different setup. A generic modem should be
added to the COM port, with the datalogger
attached to the generic modem. The generic
modem should have half-duplex enabled
(selected on the Setup screen's Hardware tab),
with all other settings at the default. The
Generic Modem's dialing string field should be
left empty.
NOTE:
If the SC95 modem setup still does
not work, ensure that the modem is set up
to be rung by the calling device and not
manually. Refer to the SC95 users manual
for more information.
B.5 DATALOGGER INITIATED
COMMUNICATIONS (CALL-BACK)
The PC must be turned on, PC208W must be
running and configured for Call-back, and the
datalogger must be programmed to initiate
communications in order for the Call-back
feature to work. PC208W automatically
configures the modem for auto answer when
the call-back box is selected.