H-5223 – Xylem H-5223 User Manual
Page 16
2.2.2 Com Port RS-232
This is the main RS-232 port for communicating to the H-5223. The RS-232 port is used to
connect to a PC, PDA, modem, or other type of serial equipment for standard serial
communications. This port is configured as a DCE type of device. This means it will plug
directly into a PC (a DTE type device), but will require a NULL modem adaptor for connecting
to most PDA’s or a modem (a DCE type device). The NULL modem cable crosses the
communication lines allowing two similar devices to communicate. Figure 2-2 shows the pin
assignments for this port.
SERIAL PORT PIN-OUT
PIN
DIRECTION
NAME (DCE)
1
No Connect
Data Carrier Detect
(DCD)
2
Output
Receive Data
(RD)
3
Input
Transmit Data
(TXD)
4
Input
Data Terminal Ready
(DTR)
5
Ground
(GND)
6
Output
Data Set Ready
(DSR)
7
Input
Request To Send
(RTS)
8
Output
Clear To Send
(CTS)
9
No Connect
Ring Indicator
(RI)
Figure 2-2 Serial Port Pin Assignments
2.2.3 Analog Input Section
The first seven connections on the terminal block are used for analog input functions. This
includes four analog inputs, two analog grounds and one +5.00 volt excitation connection.
2-2 Hardware Options and Installation
H-5223