NEC DTU-70 Instruction Manual page 67

3-7-4 Control Line
There are two types of interface for connection with external remote control, parallel
(relay contact) type and serial communication type. Both types make interface with
external control equipment through an interface board of TX control. The interface
board is shown in Fig. 3-9. The interface board is mounted on the rear side of the TX
control.
J2
J1
Parallel interface
Parallel interface
(Status)
(Command)
Fig. 3-9 Rear side view of TX control
3 - 19
J5
System Control
J3 J4
Serial Communication on Serial Communication on
Interface (RS-232C/485) Interface (RS-485) for daisy chain
GWP-G22996