Option Board; Obv-Nes - Hitachi MICRO-EHV+ Applications Manual

2.20 Option board

2.20.1 OBV-NES

Name and function of each part
(3) Basic unit connector
(bottom)
No. Item
(1) Communication port
(2) Communication LED
(3) Basic unit connector
(4) Terminating resistance
switch
Terminal layout
[1]
[8]
Socket connector
(Top view)
Communication port supports IEC programming function supporting Modbus-RTU master/slave
and general purpose communication.
*: IEC programming function is fixed to RS-485.
Flashes data transmission / reception.
This is a connector to basic unit.
This is a switch to select to enable / disable the 120Ω built-in termination resistor.
ON: Enabled
OFF: Disabled
Pin No. Signal
[1]
N.C Not used
[2]
N.C Not used
[3]
N.C Not used
[4] SG Signal ground
[5] SP Send / Receive data +
[6] SN Send / Receive data -
[7]
N.C Not used
[8]
N.C Not used
2 – 37
Type OBV-NES
Weight 15g (0.03 lb.)
(2) Communication LED
(1) Communication port
(4) Terminating resistance switch
(bottom)
Description
Meaning
Chapter 2 Specifications
Internal circuit
[1] N.C.
[2] N.C.
[3] N.C.
[4] SG
[5] SP
+
-
[6] SN
+
[7] N.C.
-
[8] N.C.

120
Terminating resistance switch