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GE Grid Solutions
Item
Jack
Protection
Error Rate
Mechanical
Environmental
2.7 Communications
The D20/D200 interfaces with peripherals and external devices over several types of
communications facilities:
Type
•
RS-232
Each installed D20ME and D20ME II provides seven RS-232 serial ports. In the D20ME II,
each port can be programmed as an RS-232 or an RS-485 port
•
Ports operate independently, at data rates up to 38400 bps
•
Each RS-232 port can provide point-to-point communication between the D20/D200 and:
−
IED or
−
Serial peripheral, such as a printer or terminal
•
RS-485
D20ME II main processor can be jumper-configured with RS-485 ports to provide point-to-
multipoint communications to substation equipment, at distances up to 4000 ft
Note: The RS-485 port on the D20ME II provides no isolation and offers limited built-in transient
suppression. If you are using the D20ME II in an environment where longer cable runs with larger
transients are expected, installation of an external transient suppression device is recommended to
protect the RTU. In addition, GE recommends the installation of an external transient suppression
device when the RS-485 communication cable must be run to devices located outside of the RTU
cabinet containing the D20ME II. Contact GE Grid Solutions Technical Support for additional
information.
GE Information
•
WESDAC 202/V.23 (vertical): RJ11 telephone jack for line connections
•
WESDAC 202/V.23 (rack): Optional integral or external jack termination
(Line, monitor and equipment, for both Tx and Rx).
•
1500 V line isolation
•
SWC ANSI/IEEE C37.90.1-1974 (2.5 kV)
•
SWC (Fast Transient) ANSI/IEEE C37.90.1-1989 (5.0 kV)
•
Relay systems test, in accordance with ANSI/IEEE C37.90-1978
•
Optional impulse/lighting protection gas-tube arresters
•
Back-to-back error rate is 1 bit error in 60,000 at 1200 bps
WESDAC 202/V.23 (rack)
•
Dimensions: 1.75" (4.4 cm) x 19" (48 cm)
WESDAC 202/V.23 (vertical)
•
Vertical mounting in D20/D200 chassis card slot, as shown in Figure 16 and
Figure 17.
•
Screw compression type terminals for 2W/4W connections. Female DB25
connector for RS-232 connection.
•
Temperature: -20 C to +60 C
•
Humidity: 0 to 95% non-condensing
Table 24 D20/D200 Communications Links
PRPI-019-3.00-10
D20/D200 Technical Overview
Description
Properties
69
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