Comdial Dsu II Digital Telephone System Instructions Manual

2.9 Connecting The Common Audible
And Auxiliary Ringing Interface
You can use the relay closure dry-contact points for controlling external audible equipment.
These contact closures track the pattern of the ringing for incoming calls. The contacts are closed
during the ringing period and are open during the silent period.
CAUTION
Do not exceed a 1 amp at 24 volts (0.5 amp at 48 volts) load on these control terminals. If the
load requirements exceed this limit, connect the load through an external slave...

CLIP TERMIINALS
26
1
{
{
Common
Audible
Station 17
Audible
39
40
41
42
43
44
45
46
47
48
49
50
Station Connector Block
(4-Line, 8-Station and
8-Line, 16-Station Base Units)
(Wiring shown for low current application - see caution text)
Wir e to
Common
Audible
Interface
Relay
Wir e to
Common
Audible
Interface
RelaySignalling
Device
Signalling
DevicePower
Source for
Signalling
DeviceAC or DC
Input as
Required
AC or DC
Input as
Required
AC or DC
Input as
Required 24V @ 1A Max.
48V @ .5A Max.
24V @ 1A Max....

2.10 Using The External Paging Interface
The system provides a special transformer-isolated paging port that you can use to couple the
system to a customer-supplied external paging amplifier. This external paging port does not
provide a talk-back path nor will it recognize DTMF dial tones.
You can use the relay closure dry-contact points that the system makes available at the ringing
port terminal for controlling the external paging amplifier during a paging operation. These
contacts close and stay...

2.11 Using A Line Port As An
External Paging Interface
You can use class of service programming to program a line port to be an AUXILIARY port. As
an AUXILIARY port, a user can use it to couple a telephone to an external paging device that
you have wired to the line port. He or she does this from any station with that line presence by
pressing the proper line button to select the AUXILIARY port. The user can dial DTMF tones or
dial pulses through the AUXILIARY port as needed. The paging enable relay...

2.12 Connecting Data Devices To The System
The DSU II includes serial data ports for use. The common equipment cabinet provides these
ports as standard modular jacks labeled COM 1 and COM 2 This section contains information on
two stages of wiring these connections for data devices.
Section 2.12.1 explains connections from stations to modular jacks. Section 2.12.2 details wiring
from the modular jack to the DSU.
2.12.1 Making Modular Jack Data Connections
Modular jack connections are wiring connections...

IBM
IBM
IBM
5 4
3
2
Front View
of Jack654321
TD
RD
SG
}From COM 1
Serial Data Port
Typical VDT
Interface
Typical
625A2
Modular
Jack
Industry Standard
Modular Line Cord
(4-conductor)Typical modular to EIA adapter
wiring shown for reference only.
Typical Personal Computer
Typical
Data Printer
1
2
3
4
5
6
7
8
9
10
11
12
1314
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
Front
Vi ew o f
JackSG RD TD
5 4
3
2
Front View
of Jack654321
TD
SG
}From COM 2
Serial Data Port
Typical Data
Printer Interface
Typical...

2.12.2 Making The Common Equipment Data Connections
You must make wiring connections from the modular jack (wall jack) to the common equipment
cabinet modular jack for the data connection.
The default data communications format is as follows:
·8-bit data with 1 stop bit and no parity
·Baud rate of 9600 baud.
Configure a data device to match this format for initial operation or reprogram the system’s data
format to match those of a data device. The tables below list the system’s data ports.
NOTE: The...

J1632 Base UnitJ0408 Base Unit
J0816 Base UnitCom 2
Com 2
Com 2 Com 3
Com 3
1.= Request to Send (RTS)
2.= Clear to Send (CTS)
3. = Receive Data (RD)
4. = Transmit Data (TD)
5. = Signal Ground (SG)
6. = No ConnectionCom 1
Com 1
Com 1 Com 4
Com 4
DSU225
(Front View of Jack)
6
5
4
3
2
1
Making Data Connections To The System
DSU II Digital Telephone System IMI66–132
Installing The DSU II Digital Telephone System 2 – 37 

2.12.3 Connecting A Personal Computer
For Remote Programming
You can connect a personal computer (PC) to the DSU II digital telephone system remotely
through modems as described below. (For information on direct connection, refer to Section
2.12.1. )
You will need the following customer-supplied equipment:
·PC and appropriate software program,
·Pair of data modems.
The data modems must be: “Hayes-compatible,” capable of 300-, 1200-, 2400-, or 9600-baud
data speeds, and have auto-answer capability. Be...

If you experience difficulty in establishing a communications path between your PC, modems,
and the digital telephone system, note the suggestions that are listed below.
·Confirm that the modems are wired correctly. Be sure RD, TD, and SG are connected to the
system’s serial data connection. Reverse connections at pins 2 and 3 if necessary.
Sometimes you must strap pin 4 to 5, or pin 6 to 7, or pin 6 to 8 to 20 in the modem wiring.
Check the modem’s installation manual for this requirement. Also check...