Xylem H-5223 - 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