Introduction - GE DigitalFlow GC868 Programming Manual

Introduction

Wiring the RS232
Interface
Serial Communications
The Model GC868 flowmeter is equipped with a standard RS232
serial interface. By using this interface, any log files stored in the
GC868's memory may be easily uploaded to a personal computer. In
order to accomplish this, the following steps must be completed:
•
Connect the GC868 to the personal computer
•
Check the GC868 baud rate setting
•
Set up the personal computer's terminal software
•
Transfer the log files to the personal computer.
This section also contains instructions for setting up an RS485 serial
interface.
The first step is to connect the built-in RS232 port in the GC868 to
one of the serial ports (COM1 or COM2) on the personal computer.
Table 6-1 below lists the standard cables available from the factory
for this purpose.
Table 6-1: GE Serial Cables
Part Number
704-659
704-660
704-661
704-662
Each of the cables listed in Table 6-1 above is available in several
standard lengths. However, a user-supplied cable may be used, if
preferred. In either case, wire the GC868 end of the serial cable in
accordance with the pin designations listed in Table 6-2 below.
Table 6-2: RS232 Pin Connections
GC868
Pin # Cable Color
1 (RTN) Green
2 (TX) Black
3 (RX)
4 (DTR) White
5 (CTS) Yellow
Note: For basic serial communications between a single GC868 and
a personal computer, no connections are required to pins 4
and 5 of the GC868's serial connector. However, these pins
should be jumpered together to ensure proper operation.
PC Connector GC868 Connector
DB-25 Male
DB-9 Male
DB-25 Female
DB-9 Female
GE DB-25 Cable
Pin #
7
3
Red 2
20
5
April 2008
Flying Leads (5)
Flying Leads (5)
Flying Leads (5)
Flying Leads (5)
DB-9 Cable
Pin #
5
2
3
4
8
6-1