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“LS Ubiquitous RF-ID System”
3.3.2 RS-422 Cable Specification
When connecting the upper system such as PLC and LGRF-H Reader, RS-422
communication is available. At this time, RS-422 Shield Cable shall be used for connection.
[Table 3.3.2.1] RS-422 Connection Cable
* According to the site situation, end resistance (120
Ω
, 1/2 w) is required.
TX-
TX+
RX-
RX+
RDA
SDB
SDA
RDB
RX-
RX+
TX-
TX+
[PLC communication card] [LGRF-H Reader]
[Fig. 3.3.2.1] RS-422 Connection Cable
The cable shown on [Fig. 3.3.2.1] is RS-422 connection cable suitable for LGRF-H
specification and in case of connection, RX terminal and TX terminal should be cross.
RX terminal (PLC side) should be connected to TX terminal (LGRF-H side) and TX terminal
(PLC side) should be connected to RX terminal (LGRF-H side). For communication cable, it is
recommended to use the shielded cable. As most of poor communication results from the wrong
selection of cable, you should confirm the specification of connection cable when installing it.
PLC
Pin No.
Name
1 RxD+
2 RxD-
3 TxD+
4 TxD-
LGRF-H
Name
Pin No.
TxD+ 1
TxD- 2
RxD+ 3
RxD- 4
Summary of Contents for LGRF-H
Page 23: ...23 70 LS Ubiquitous RF ID System 2 4 Product Appearance and Dimension Fig 2 4 1 LGRF H Reader...
Page 24: ...24 70 LS Ubiquitous RF ID System Fig 2 4 2 LGRF H Reader Fig 2 4 3 Antenna A Type...
Page 25: ...25 70 LS Ubiquitous RF ID System Fig 2 4 4 Antenna B Type Fig 2 4 5 Antenna C Type...
Page 70: ...70 70 LS Ubiquitous RF ID System 2 Example of MELSEC PLC ASCII mode communication...
