Xylem H-4271 - Manual (Page 11)

Chapter 2
Installation
2.1 General Installation Recommendations
The enclosure and connectors are not weather tight. The H-4271 must be installed in a protected
location or a weather tight enclosure. The housing has a 2-terminal connector for making power
connections and a 9-terminal DB-9 connector for the RS-232 port.
Caution: Remove all power from the unit before making any connections.
2.2 Power Connection
Connect the +12V and GND terminals to a 12V power
source. Even though the H-4271 normally operates in a
low power mode, the transmitter requires 500mA for short
bursts. Make certain your wiring and battery is capable of
supplying sufficient current.
2.3 Data Connector
The H-4271 has a standard 9-pin RS-232 connector and is a DCE (modem) device. Connect the
RS-232 port to the serial port of your personal computer or other host device with a standard 9-
pin RS-232 cable. No gender changes or null-modem adapters are needed.
Program your host device for 9600 baud, 8-bit, no parity, full-duplex communication.
RS-232 Connector
Pin Name Direction Description Function
1 nc not used
2 TxD Output Transmit Data Transmit data to host device
3 RxD Input Receive Data Receive data from host device
4 DSR Input Data Set Ready Awakens the H-4271 when asserted.
5 GND Ground Ground
6 DTR Data Terminal
Ready Internally connected to Pin-4
7 CTS Input Clear To Send Connected to the GPI1/RTS
pin of the 9Xstream module
8 RTS Output Request To Send Connected to the GPO1/CTS output
pin of the 9Xstream module
9 nc not used
H-4271
Installation And Maintenance 2-1