GE DigitalFlow GS868 User Manual

DigitalFlow™ GF868 Programming Manual (1-Channel) 77
Chapter 6. Serial Communications
6.5 The Optional RS485 Serial Interface
Although the standard RS232 serial interface included with the Model GF868 is adequate for most applications, GE
offers an optional RS485 serial interface upgrade for special situations. The Model GF868 is easily modified to provide
RS485 communications, and this section describes the wiring and use of the special RS232 to RS485 converter.
Note: For compliance with the European Union’s Low Voltage Directive, this unit requires an external power
disconnect device such as a switch or circuit breaker. The disconnect device must be marked as such, clearly
visible, directly accessible, and located within 1.8 m (6 ft) of the electronics console.The power cord is the
main disconnect device.
6.5.1 Interface Converter Mounting
A special bracket containing the serial interface converter and a three-terminal barrier strip is mounted inside the
Model GF868, just below the RS232 terminal block (see Figure 9). The standard RS232 terminal block is wired to the
input of the serial interface converter, and the RS485 output of the serial interface converter is wired to the barrier strip.
Figure 9: Interface Converter Mounting
RS 232
TT
TR
T
SNR
XX
CD R
DN
CHAN 1
G
I
S
GNN
S
I
R
T
R
T
UP
D
C
R
S
- XMT +
Red (XMT+)
RS232 Terminal Block
Standoff
Mounting Bracket
Barrier Strip
LVD Shroud
Green (XMT–)
Grounding
Screw
G N/L2 L1 AC
G – + DC

GE DigitalFlow GS868 Specifications

General

Brand	GE
Model	DigitalFlow GS868
Category	Measuring Instruments
Language	English