Campbell Scientific AL200 ALERT2 Encoder, Modulator, and Sensor Interface - Manual (Page 25)

Appendix B. Cables and Connector Pin
Descriptions
B.1 CS I/O
CS I/O is an interface unique to Campbell Scientific products. CS I/O uses
TTL signaling. CS I/O devices are connected using a 9-pin, straight-through,
male to female cable with all 9 pins connected. Use of the supplied SC12 cable
(pn 16675) is recommended.
TABLE B-1. CS I/O Pin Description
Pin Datalogger Function, DB9 Female AL200 Function, DB9 Male
1
5 VDC N/C
2 SIGNAL GND SIGNAL GND
3 RING RING
4 RXD TXD
5 ME ME
6 SDE SDE
7 CLK/HS CLK/HS
8 12 VDC N/C
9 TXD RXD
B.2 RS-232
RS-232 is used for asynchronous serial communication. It is a standard
EIA/TIA-232 DB9 socket female DCE interface. A DB9 male to male null
modem cable (pn 18663) is used to connect the AL200 to a Campbell
Scientific datalogger’s RS-232 port.
TABLE B-2. RS-232 Pin Description
Pin AL200 Function, DCE, DB9 Female
1
N/C
2 TXD
3 RXD
4 N/C
5 SIGNAL GND
6 N/C
7 CTS
8 RTS
9 N/C
B-1