Campbell Scientific SC-USB USB to CS I/O Optically Isolated Interface - Manual (Page 31)

SC-USB USB to CS I/O Opto-isolated Interface
3.2.1.2 Selecting a Fixed Baud Rate
Bit rate selections available are 9600, 19200, 38400, 57600, 76800 and 115200
baud as shown in the screenshot above. Select the highest rate supported by
the dataloggers being used.
3.2.1.3 Enable All Comms Modes (Automatic Mode Detection)
Selecting ‘Enable all Comms Modes’ automatically connects to the datalogger
using the communications method that uses the least physical hardware
resources. The priorities from highest to lowest are CSDC, SDC and finally
Modem Enable (ME) mode. The default mode can be used in most cases.
Exceptions are:
• When other SDC or CSDC peripherals are being used, in which case a free
address must be selected.
• When Call Back is being used it may be necessary to fix the
communication method to ME.
• When using non-PakBus TD dataloggers, where the mode must be set to
ME.
• When using a CR5000 datalogger with an operating system version earlier
than 2.0, where the mode must be set to ME.
Enable All Comms Modes is the Factory default.
3.2.1.4 Enable CSDC Address 7 Mode
Selecting ‘Enable CSDC Address 7 Mode’ will force the SC-USB to only
respond as the CSDC device with SDC address 7. This is useful when you
have another SDC-Concurrent device connected on the CSI I/O port. The
modem enable line (pin 5) is not used and is free for other use. CSDC mode
allows concurrent communication sessions. It is currently supported by
PakBus dataloggers and recent versions of the CR5000 operating system.
3.2.1.5 Enable CSDC Address 8 Mode
Selecting ‘Enable CSDC Address 8 Mode’ will force the SC-USB to only
respond as the CSDC device with SDC address 8. This is useful when you
have another CSDC device connected on the CS I/O port. The modem enable
line (pin 5) is not used and is free for other use. CSDC mode allows
concurrent communication sessions. It is currently supported by PakBus
dataloggers and recent versions of the CR5000 operating system.
3.2.1.6 Enable SDC Comms Mode
Selecting ‘Enable SDC Comms Mode’ will force the SC-USB to only respond
as an SDC communication device at address 9. In this mode asynchronous
communication is used at the chosen bit rate. The Modem Enable line (pin 5)
is not used and is free for other use. SDC mode allows the SC-USB to be
connected in parallel with modem devices. This mode is only supported in
CR510, CR10X and CR23X dataloggers with post-2002 standard (non-
PakBus) operating systems.
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