ABB RER 133 Descripción técnica - Página 11
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1MRS755163
6.
RER 133
Technical Description
Interfaces
The RS-485 bus used by SPA, Modbus and DNP 3.0 requires a daisy chain topology.
A daisy chain topology means a node-to-node connection, where nodes are chained
using cables of minimal length. The cables must be point to point, no stars, rings or
other topologies are allowed. The bus must be terminated at both ends using 120
resistors. The RER 133 includes as an option the use of internal termination
resistors. These resistors are enabled through DIP switch S2.
Pull-up and pull-down resistors must be used in one of the nodes, in order for the
receivers to be able to determine the state of the bus when it is idle. These resistors
can be enabled through DIP switch S2.
Please see sections "Module configuration" on page 9 and "Configuration
examples" on page 10 for the correct settings.
The RS-232 interface (X1) of the RER 133 module is shown in Fig. 6.-1.
Pin Usage
1
Not connected
2
TX
3
RX
4
+15 V DC, power supply for the RER 133 module
5
GND, signal ground for power supply
6
DSR (CD/CS)
7
RTS
8
Not connected
9
Not connected
Fig. 6.-1 Pin usage table for the 9-pin D-type connector (X1)
The RS-485 interface of the RER 133 module is shown in Fig. 6.-2. The connector
(X2) is an 8-pin Weidmüller terminal block. If GND (pin 5) is used, then it is
required for all other nodes to be isolated as well.
Pin Signal
Functionality
1
Shield GND
Can be used for cable shield
grounding
2
Shield GND C Can be used for cable shield
grounding via a capacitator
3
NC
Not connected
4
AGND
Can be used for potential
balancing between RS-485 nodes
5
B-
Differential signal B (-)
6
A+
Differential signal A (+)
7
B-
4-wire differential signal B (-)
8
A+
4-wire differential signal A (+)
Fig. 6.-2 Pin usage table for the Weidmüller terminal block (X2)
1) used for Tx in 4-wire connection
2) used for Rx in 4-wire connection
Bus Connection
RER 133
1 2 3 4 5
6 7 8 9
1)
1)
2)
2)
Module
Ω
A050323
A050324
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