GE DigitalFlow XMT868i Startup Manual page 18

Chapter 1. Installation
1.7.4a Wiring the RS232 Interface
Use the serial port to connect the Model XMT868i flow transmitter to a printer, an ANSI terminal or a personal
computer. The RS232 interface is wired as Data Terminal Equipment (DTE), and the signals available at terminal block
are shown in Table 1 below. Refer to Figure 10 on page 23 and complete the following steps:
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1. Disconnect the main power to the unit and remove the rear cover.
2. Install the required cable clamp in the chosen conduit hole on the side of the electronics enclosure.
3. Use the information in Table 1 to construct a suitable cable for connecting the Model XMT868i to the external
device. If desired, an appropriate cable may be purchased from GE.
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Pin #
5
6
7
8
9
Note: Signal names that imply direction (e.g., transmit and receive) are named from the point of view of the DTE
device (the GE 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.
4. Feed the flying leads end of the cable through the conduit hole and wire it to terminal block
other end of the cable to the printer, ANSI terminal or personal computer, and secure the cable clamp.
WARNING!
Appendix A, CE Mark Compliance.
After the wiring has been completed, consult the User's Manual for the external device to configure it for use with the
XMT868i.
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Table 1: RS232 Connection to DCE or DTE Device
Signal Description
DTR (Data Terminal Ready)
CTS (Clear to Send)
COM (Ground)
RX (Receive)
TX (Transmit)
To meet CE Mark requirements, all cables must be installed as described in
DCE DCE
DB25 DB9
Pin # Pin #
20 4
4 7
7 5
2 3
3 2
DTE DTE
DB25 DB9
Pin # Pin #
20 4
5 8
7 5
3 2
2 3
. Connect the
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DigitalFlow™ XMT868i Startup Guide