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Appendix A. CS I/O Port
The CS I/O port is Campbell Scientific's input/output port. It is not a standard
RS-232 pin-out. The following table provides pin-out information on the port
when connected to a datalogger.
Pin
Name
1
5 V (supplied by the
datalogger)
2
Signal Ground
3
Ring
4
RXD
5
Modem Enable
6
Synchronous Device
Enable
7
Clock/Handshake
8
12 V (supplied by the
datalogger)
9
TXD
Signal
Type
Description
Input
Not used by NL1110
Provides reference for voltage
levels
Output
Raised by a NL110 to put the
datalogger into the
telecommunications mode
Output
Serial data transmitted to the
datalogger
Input
Raised by the datalogger when
it determines that the NL110
raised the ring line
Input
Used by the datalogger to
address the NL110 when the
NL110 is configured as a
synchronous device
Input
Used by the datalogger with
SDE and TXD lines to address
and transfer data to
synchronous devices
Not used by the NL110
Input
Serial data received from the
datalogger
A-1
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