Connection Diagram; Cable - Mitsubishi Electric GT16 User Manual

28.3 Connection Diagram

28.3.1 RS-485 cable
The following shows the connection diagrams and connector specifications of the RS-422/485 cable used for connecting
the GOT to a ENERGY MEASURING UNIT ELECTRIC MULTI-MEASURING INSTRUMENT.
RS-485 connection diagram 1)
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
RSA(RTS+)
14
NC
15
RSB(RTS-)
16
NC
17
CSA(CTS+)
18
NC
19
CSB(CTS-)
20
*1 The signal name differs depending on the series name. Refer to the following table.
*2 Short-circuit between the following terminals of the energy measuring unit or electric multi-measuring instrument which will be a terminal.
By the short circuit of the following terminals, a terminating resistor with 120 is connected.
*3
*4

Precautions when preparing a cable
(1) Cable length
The total distance (between GOT and controllers) of the
RS-422 cable must be 13m or less.
(2) Connector conversion box side connector
For the Connector conversion box side connector, refer
to the following.
6.7 Connector Conversion Box
28 - 2
28. ENERGY MEASURING UNIT/ELECTRIC MULTI-MEASURING INSTRUMENT CONNECTION
28.3 Connection Diagram
*3
Series name
Energy measuring unit
Electric multi-measuring instrument
Series name
Energy measuring unit
Electric multi-measuring instrument
Set the terminating resistor of the Handy GOT to "Enable".
4.2 Back Panel
Ground a shield correctly.
ENERGY MEASURING UNIT
ELECTRIC MULTI-MEASURING
INSTRUMENT (1st)
Signal name
*1
1)
*1
2)
Ter
SLD
*4
Signal name 1) Signal name 2)
RS485+ RS485-
T/R+ T/R-
Signal name
RS485- < - >
T/R- < - >

Connecting terminating resistors
(1) GOT side
When connecting an energy measuring unit/electric
multi-measuring instrument to the GOT, a terminating
resistor must be connected to the GOT.
Set the terminating resistor using the terminating
resistor setting switch.
For the procedure to set the terminating resistor, refer
to the following.
4.2 Back Panel
(2) Energy measuring unit/electric multi-measuring
instrument side
When connecting an energy measuring unit/electric
multi-measuring instrument to the GOT, a terminating
resistor must be connected to the energy measuring
unit/electric multi-measuring instrument.
For details, refer to the energy measuring unit/electric
multi-measuring instrument user's manual.
ENERGY MEASURING UNIT
ELECTRIC MULTI-MEASURING
INSTRUMENT (1st)
Signal name
*4
Signal name
Ter
Ter
*1
1)
*1
2)
*2
Ter
SLD