Appendix c. serial port pin outs, C.1 rs-232 communications port, C.1.1 pin-out – Campbell Scientific CR200/CR200X-series Dataloggers User Manual
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Appendix C. Serial Port Pin Outs
C.1 RS-232 Communications Port
C.1.1 Pin-Out
Pin configuration for the CR200(X) RS-232 9-pin port is listed in
TABLE.
CR200(X) RS-232 Pin-Out
The CR200(X) RS-232 port is a DCE (Data Communication Equipment) device.
A limited version of the RS-232 port is supported with no hardware flow
control. The most common use of the Datalogger's RS-232 port is a connection
to a computer DTE device. A standard DB9-to-DB9 cable can connect the
computer DTE device to the Datalogger DCE device.
The CR200(X) RS-232 port is not electrically isolated. Connection to an AC
powered computer may cause ground loops leading to measurement problems.
Maximum input = ±25 V
Maximum Output = ±13 V
Typical Output = ±5.4 V
The following table describes the Datalogger's RS-232 pin function with
standard DCE naming notation.
Table 28. CR200(X) RS-232 Pin-Out
PIN
: Pin number
O
: Signal Out of the CR200(X) to a RS-232 device
I
: Signal Into the CR200(X) from a RS-232 device
PIN
DCE Function
Logger Function
I/O
Description
1
N/A
Not Connected
2
TX
TXD
O
Asynchronous data Transmit
3
RX
RXD
I
Asynchronous data Receive
4
N/A
Not Connected
5
GND
GND
Ground
6
DSR
DTR
O
Data Terminal Ready
7
N/A
Not Connected
8
CTS
RTS
O
Request to send
9
N/A
Not Connected
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