Specifications

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Table 1

Dialing Scheme

Zone Code Zones

00 All Call

01 - 68 Individual Zones

71 - 87 Fixed Zone Groups

91 - 99 Logical Zone Groups

Note: Zone Code is the splitter zone DTMF tone.

All splitters must use the same CLASS of wiring (CLASS “A” or “B”) for the audio output zones. See the

SP4-APS Installation Instructions (P84577) for proper wiring of these zones.

Individual Zone and Fixed Zone Group sequence numbers are controlled by the placement of the splitters

in the RS485 digital communication circuit. The first splitter connected to the RS485 digital control port on

the SP4-TZC will be assigned the first zone codes (Individual Zone codes of “01” and “02” for CLASS

“A”, Individual Zone codes of “01” through “04” for CLASS “B”, and a Fixed Zone Group code of “71”).

Using the previous example where the first splitter covers the warehouse area, let’s add a second splitter

covering the front office area. If the paging zones are set for CLASS “A” then the warehouse will have

Individual Zone codes of “01” and “02”. The front office area Individual Zone codes will be “03” and “04”.

The Fixed Zone Group code for the warehouse will be “71”, and the front office Fixed Zone Group code

will be “72”

INDIVIDUAL

ZONE CODES =

01,02

FIXED ZONE

CODE = 71

INDIVIDUAL

ZONE CODES =

03,04

FIXED ZONE

CODE = 72

INDIVIDUAL

ZONE CODES =

05,06

FIXED ZONE

CODE = 73

INDIVIDUAL

ZONE CODES =

07,08

FIXED ZONE

CODE = 74

INDIVIDUAL

ZONE CODES =

09,10

FIXED ZONE

CODE = 75

SP4-TZC

SP4-APS

SP40/2

SPB-160

#4 #5

RS485

RS485 RS485

TO ADDITIONAL

SP4-APS SPLITTERS

CONNECT THE SP4-TZC RS485 CONNECTION

TO THE SP40/2 SP4-APS FIRST.

Figure 1

RS485 Communications Path from SP4-TZC to Last CLASS “A” Splitter

Figure 1 shows the path of the RS485 digital control loop and the sequence of the splitters in that loop. The

SP40/2 splitter is always

the first splitter connected to the RS485 loop. Notice on Figure 1 that the

individual and Fixed Zone Group codes are listed for a CLASS “A” splitter configuration. The SPB-160 is

used as an example of an audio booster.