Hitachi EH-150 Series Applications Manual page 27

Terminal layout
1
6
 Signal name and Connector pin arrangement (Port2)
Table 4.9 Signal name (EH-SIO side) and connector pin arrangement (Port2 / RS-422/485)
Pin
Signal Name Symbol
No.
1 Send data +
Send data –
2
3 Receive data +
Receive data –
4
Built-in
5
terminator
6 Ground for signal
« Note »
A communication cable should use the twisted pair wire with a shield.
Table 4.8 RS-422/485 Signal (Port2)
No. Signal Signal Name
1 Send data +
SD +
Send data –
2 SD –
3 Receive data +
RD +
Receive data –
4 RD –
5
TERM Built-in terminator
6
SG Ground for signal
Signal Direction
EH-SIO External device

SD +
SD – 

RD +
RD – 
( RD –)
TERM
SG --

Data send from EH-SIO.

Data send from EH-SIO.

Data received from external device.

Data received from external device.
When you use built-in terminator, please connect
--
with RD –.
-- Ground for signal
4 - 7
Chapter 4 Installation
Diagram of internal circuit
1) SD+
+
–
2) SD–
3) RD+
+
–
4) RD–

110
5) TERM
6) SG
Specifications