Communications; Configuring An Rs232 Connection - GE Multilin F650 Instruction Manual

1 GETTING STARTED
b) CONFIGURING AN RS232 CONNECTION
Before starting, verify that the RS232 serial cable is properly connected to the RS232 port on the front panel of
the relay.
1. Install and start the latest version of the EnerVista F650 Setup software (available from the GE
EnerVista CD or online from
lation instructions).
2. Go to "Communication>Computer" and enter the following data referred to communications:
3. Select Control Type as No Control Type from the drop-down list. This option will display a number
of interface parameters that must be entered for proper serial communications.
4. Enter the relay Slave Address ("Setpoint>Product Setup >Communication Settings>ModBus
Protocol" menu) in the Slave Address field.
5. Enter the physical communications parameters (Baudrate and parity settings) from "Set-
point>Product Setup >Communication Settings>Serial Ports" menu, in their respective fields.
6. The Device has now been configured for RS232 communications. Proceed to press the ON but-
ton to begin communicating.
To communicate with the relay via the faceplate RS232 port, a standard "straight through" serial cable is used. The DB9
male end is connected to the relay and the DB9 or DB25 female end is connected to the PC COM1 or COM2 port as
described in the figure below.
Direct connection to the Ethernet port will be carried out using a crossover cable. If this connection is performed through a
hub or switch, we will use direct Ethernet cable.
To communicate with the relay rear RS485 port from a computer RS232 port, an RS232/RS485 converter box is needed.
We recommend using the F485 converter, manufactured by GE. This converter box is connected to the computer using a
straight through serial cable. A shielded twisted pair (20, 22 or 24 AWG according to the American standards; 0.25, 0.34 or
2
0.5 mm according to the European standards) cable is used to connect the converter box to the relay rear communications
terminals. In order to minimize communication errors that could be caused by external noise, it is recommended to use a
shielded twist pair. In order to avoid loops where external currents could flow, the cable shield must be grounded only at
one end.
The converter box (-, +, GND) terminals are connected to the relay (SDA, SDB, GND) terminals respectively. For long
communications cables (longer than 1 km), the RS485 circuit must be terminated in a RC network (i.e. 120 ohm, 1 nF). This
circuit is shown on Figure 1–17:: RS485 CONNECTION FOR F650 UNITS, associated to text Zt(*).
GE Multilin
http://www.GEindustrial.com/multilin
F650 Digital Bay Controller
1.3 ENERVISTA F650 SETUP SOFTWARE
(see previous section for instal-

1.3.4 COMMUNICATIONS

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