Mitsubishi Electric GT1685 Connection Manual page 687

RS485 connection diagram 2)
(For 2 pair wiring)
Serial multi drop
* 2
connection unit
* 1
RDA
* 1
RDB
* 1
SDA
* 1
SDB
SG
* 5 * 5
*1 Use the twisted pair cable for SDA/SDB and RDA/RDB.
*2 Set the terminating resistor selector to "330 ".
*3 Set the terminating resistor setting switch of the GOT main unit to "Disable".
*4 Connect a 330
*5 Make sure to ground a cable shield line by applying Class D Grounding.
* 3
CON side (20pin)
SDA1(TXD1+)
6
SDB1(TXD1-)
8
RDA1(RXD1+)
10
RDB1(RXD1-)
12
SG
2
NC
1
NC
3
NC
4
SDA2(TXD2+)
5
SDB2(TXD2-)
7
RDA2(RXD2+)
9
RDB2(RXD2-)
11
NC
13
* 5 * 5
RSA(RTS+)
14
NC
15
RSB(RTS-)
16
NC
17
CSA(CTS+)
18
NC
19
CSB(CTS-)
20
1.4.3 Terminating resistors of GOT
terminating resistor to the GOT to be a terminal.
* 3
CON side (20pin)
SDA2(TXD2+)
5
SDB2(TXD2-)
7
RDA2(RXD2+)
9
RDB2(RXD2-)
11
SG
2
NC
* 5
1
NC
3
NC
4
SDA1(TXD1+)
6
SDB1(TXD1-)
8
RDA1(RXD1+)
10
RDB1(RXD1-)
12
NC
13
RSA(RTS+)
14
NC
15
RSB(RTS-)
16
NC
17
CSA(CTS+)
18
NC
19
CSB(CTS-)
20
20. GOT MULTI-DROP CONNECTION
20.4 Connection Diagram
* 3
CON side (20pin)
SDA1(TXD1+)
6
R
SDB1(TXD1-)
8
* 4
RDA1(RXD1+)
10
R
RDB1(RXD1-)
12
* 4
SG
2
NC
* 5
1
NC
3
NC
4
SDA2(TXD2+)
5
SDB2(TXD2-)
7
RDA2(RXD2+)
9
RDB2(RXD2-)
11
NC
13
RSA(RTS+)
14
NC
15
RSB(RTS-)
16
NC
17
CSA(CTS+)
18
NC
19
CSB(CTS-)
20
20 - 19
17
18
19
20
21
22
23