Hitachi EH-150 Series - Connection of RS-422; 485 Interface

Chapter 4 Installation
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4.3.2 Connection of RS-422 / 485 interface
The port 1 and 2 can select a communication interface. When you use RS-422 or RS-485 interface, please set up
with a communication setting switch. In addition, RS-422 or RS-485 interface is decided by connection of signal.
Table 4.6 RS-422 / 485 Signal (Port1)
Terminal layout
No.
Signal
Signal Name
Diagram of internal circuit
1
SG
Ground for signal
2
N.C.
(Not used)
3
N.C.
(Not used)
4
SD+
Send data +
5
SD-
Send data –
6
RD-
Receive data –
7
RD+
Receive data +
8
N.C.
(Not used)
 Signal name and Connector pin arrangement (Port1)
Table 4.7 Signal name (EH-SIO side) and connector pin arrangement ( Port1 / RS-422/485)
Pin
No.
Signal Name
Symbol
Signal Direction
Specifications
EH-SIO
External device
1
Ground for signal
SG


Ground for signal
2
(Not used)
N.C.
--
--
Not used
3
(Not used)
N.C.
--
--
Not used
4
Send data +
SD+


Data send from EH-SIO.
5
Send data –
SD-


Data send from EH-SIO.
6
Receive data –
RD-


Data received from external device.
7
Receive data +
RD+


Data received from external device.
8
(Not used)
N.C.
--
--
Not used
8
1
....
Micro Processor
1) SG
4) SD+
5) SD-
7) RD+
6) RD-
+
-
+
-