Wiring The Rs232 Serial Port - GE UTX878 Ultrasonic User Manual

Wiring the RS232 Serial
Port
Table 1-1: RS232 Connection to DCE or DTE Device
Colors for GE
Panametrics
Cable (flying
Communication
TB4
1
2
3
4
5
Installation
The Model UTX878 flow transmitter is equipped with a built-in
RS232 serial communications port. Proceed to the section below for
wiring instructions. For more information on serial communications,
refer to the EIA-RS Serial Communications manual (916-054).
Use the serial port to connect the Model UTX878 flow transmitter to
an ANSI terminal or a personal computer. The RS232 interface is
wired as Data Terminal Equipment (DTE), and the signals available
at the COMMUNICATION terminal block are shown in Table 1-1
below.
1. Follow the instructions on page 1-4 to prepare the unit before you
connect power.
2. Use the information in Table 1-1 below to construct a suitable
shielded cable for connecting the Model UTX878 to the external
device. If desired, an appropriate cable may be purchased from GE
Panametrics.
Note: The DTR and RTS signals power the UTX878 communication
circuit and are required for proper operation. Consult the
factory if you have additional questions.
Note: Signal names that imply direction (e.g., transmit and receive)
are named from the point of view of the DTE device (the GE
Panametrics meter is usually considered the DTE device).
When the RS232 standard is strictly followed, these signals
are labeled with the same name and pin # on the DCE device
side as well. Unfortunately, the convention is not followed
because the DTE and DCE side get confused. Therefore,
connections that imply direction are changed to reflect their
direction on the DCE side.
Signal
leads) Description
Brown DTR
White RTS
Black Signal Ground
Red UTX878 (Transmit)
Green UTX878 (Receive)
DCE DCE DTE
DB25 DB9 DB25
Pin # Pin # Pin #
20 4 20
4 7 4
7 5 7
2 3 3
3 2 2
March 2004
DTE
DB9
Pin #
4
7
5
2
3
1-9