Wiring The 0/4-20 Ma Analog Outputs; Wiring The Serial Port; Wiring The Rs232 Interface - GE DigitalFlow GS868 Startup Manual
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Also See for DigitalFlow GS868:
- Programming manual (171 pages) ,
- Startup manual (81 pages) ,
- Service manual (74 pages)
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Chapter 1. Installation
1.6.3 Wiring the 0/4-20 mA Analog Outputs
The standard configuration of the Model GS868 flowmeter includes two isolated 0/4-20 mA analog outputs
(designated as A and B). Connections to these outputs may be made with standard twisted-pair wiring. The current loop
impedance for these circuits must not exceed 550 ohms.
Refer to Figure 10 on page 20 for the location of terminal block
1.6.4 Wiring the Serial Port
The Model GS868 is equipped with a built-in serial communications port. The standard port is an RS232 interface, but
an optional RS485 interface is available upon request. Proceed to the appropriate sub-section for wiring instructions.
For more information on serial communications, refer to the EIA-RS Serial Communications Manual (916-054).
1.6.4a
Wiring the RS232 Interface
The RS232 communications port provides a serial interface for connecting the Model GS868 flowmeter to a printer, an
ANSI terminal or a personal computer.
The RS232 serial interface is wired as Data Terminal Equipment (DTE), and the signals available at the Model GS868
RS232
terminal block are shown in Table 1 below. Refer to Figure 8 on page 16 to locate terminal block
complete the following steps to wire the terminal:
1. Use the information in Table 1 below to construct a suitable cable for connecting the Model GS868 to the external
device. If desired, an appropriate cable may be purchased from GE.
2. Wire the flying leads end of the cable to terminal block
ANSI terminal or personal computer.
After the wiring has been completed, consult the User's Manual for the external device to configure it for use with the
Model GS868.
10
Table 1: RS232 Connection to DCE or DTE Device
RS232
Pin #
Signal Description
1
RTN (Return)
2
TX (Transmit)
3
RX (Receive)
4
DTR (Data Terminal Ready)
5
CTS (Clear to Send)
I/O
and wire the terminal block as shown.
DCE
DTE
DB25
DB25
Pin #
Pin #
7
7
3
2
2
3
20
20
4
5
RS232
and connect the other end of the cable to the printer,
RS232
DTE
DB9
Pin #
5
3
2
4
8
DigitalFlow™ GS868 Startup Guide
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