A-1
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
Signal
Type
Description
1
5 V (supplied by the
datalogger)
Input
Not used by NL1110
2
Signal Ground
Provides reference for voltage
levels
3
Ring
Output
Raised by a NL110 to put the
datalogger into the
telecommunications mode
4
RXD
Output
Serial data transmitted to the
datalogger
5
Modem Enable
Input
Raised by the datalogger when
it determines that the NL110
raised the ring line
6
Synchronous Device
Enable
Input
Used by the datalogger to
address the NL110 when the
NL110 is configured as a
synchronous device
7
Clock/Handshake
Input
Used by the datalogger with
SDE and TXD lines to address
and transfer data to
synchronous devices
8
12 V (supplied by the
datalogger)
Not used by the NL110
9
TXD
Input
Serial data received from the
datalogger
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