Campbell Scientific DC112 Telephone Modem - Manual (Page 7)

DC112 MODEM
5
TABLE 1. Jumper Settings
JUMPER PINS MEANING FACTORY SETTING
1. H15 1 to 8 Result Codes Enabled Jumper in Place
2. H15 2 to 7 Auto-Answer Disabled Jumper not in Place
3. H15 3 to 6 Enable CCITT V.22 Jumper not in Place
4. H15 4 to 5 Do not use Jumper not in Place
5. C8 1 to 2 Non-datalogger Site Jumper not in Place
JUMPER 1 - Result codes (Appendix A) are
sent to your terminal screen.
JUMPER 2 - Auto answer is disabled by putting
the jumper in place. This option is used only
when the modem is not to answer a call. For
example: The DC112 is connected to a phone
line which is to be used part time for voice
communication. In this situation it is best to
have the datalogger call the computer.
JUMPER 3 - Selects Bell 212A (U.S. and
Canada) or CCITT V.22 (Foreign). This does
not mean that the DC112 is tested and
approved for all foreign countries.
CCITT is an international consultative
committee that sets international
communications usage standards. V.22 is a
standard that the DC112 meets for
communicating at 1200 baud.
JUMPER 5 - Non datalogger site. This option
when enabled keeps the printer enable line from
disabling the transmit data line. This option is
provided because of the CR10 datalogger's
ability to synchronously address peripherals
connected to the 9 pin port (CR10 Manual,
Section 6.2). This Jumper is only used when
the DC112 is used as originate modem at the
computer.
Jumpers 1, 2, and 3 determine the state of the
modem when power is switched on by Modem
Enable or the ATZ command is executed.
Other functions which are fixed by hardware
are:
Numeric Result Codes
Full Duplex
Command Characters Echoed
Both the jumper selectable and fixed functions
can be changed by appropriate "AT" commands
(see Appendix A).