Installing Customer-Provided Terminal Using Asynchronous Data Units (Adus) - AT&T 75 Wiring Manual

The property management system interface and the journal printers can also be installed
using Asynchronous Data Unit (ADUs). The connections are the same as for a customer-
provided data terminal (see Figure 4-99).

Installing Customer-Provided Terminal Using Asynchronous Data Units (ADUs)

The interface between the system and the customer's data terminals and host computer for
R1V1, R1V2, and R1V3 systems is through PDMs. Refer to installing PDMs for details (see
Figures 4-96 and 4-97).
For R1V2 or R1V3 systems only, the customer's asynchronous data terminals can be
connected through a Z3A Asynchronous Data Unit (ADU) to a TN726 Data Line circuit pack
(see Figure 4-99). Normally, the ADU is powered from the connected data terminal. The
ADU can also be remotely or locally powered using a 2012D transformer equipped with a
248B adapter. ADUs connected to receive-only printers always require external power. The
need for external power must be determined experimentally for ADUs connected to other
devices. For details on ADU installation, refer to the Z3A Asynchronous Data Unit User's
Manual, (555-401-701).
Installation
1.
Determine port assignment of ADU from Data Module Form:
2 .
Install jumper wires at cross-connect field.
3 .
Connect RS-232 plug on ADU to data terminal.
4 .
Run and connect 4-pair line cord (modular plug on both ends) from information
outlet to ADU (see Figure 4-99).
Administer per AT&T System 75 and System 75 XE Implementation and A T & T
5.
System 75 and System 75 XE Administration.
EXAMPLE: Port Number
66-TYPE HARDWARE
B 02 0 1
Carrier Slot Circuit
4-151