User's Manual

ENCODER

TRANSMITTER

PSU

AUDIO (SK1)

RS232 DATA

MODE

RTS

CTS

Tx KEY

DATA

BEEP

GND (SK4)

SK3

(SK1 or SK2)

POWER (SK3)

PL1

ANTENNA

SK4

TL9

TL8

TL2 TL1

P4 P5 P7 P6

TAG10817-1

SK5

RV1 - AUDIO ADJUST

DLCs 1 - 8

POWER

TM 1184 Issue 1 AL1 (May 1997) Page A1 - 5

Figure 1: Encoder Connections

TECHNICAL DESCRIPTION

NOTE: For a circuit description of the Transmitter, refer to Section 3.

8. The RPE 673 Serial Encoder provides a communications link between any device with

a standard RS232 data output and up to 10,000 paging receivers. Valid data is

processed by a purpose built digital Encoder and fed to a 2.5W UHF Transmitter (based

upon the RPT 633) for onward transmission.

9. The Encoder is driven by the serial RS232 data input (SK1 or SK2) and the eight DLC

inputs (SK3 and SK5) using ESPA 4.4.4 or MEP protocol (as determined by firmware).

Receipt of serial data or closure of any DLC causes the Encoder to enter the call

generation routine. A paging transmission is assembled in either Mk6 or Mk7 paging code

format. The format is selected during installation (refer to paragraph 24).

10. The eight DLC inputs may be used for remotely sited contacts which must close to initiate

paging calls. The DLC paging messages can be configured during installation (refer to

paragraph 24).

11. Figure 1 illustrates Encoder input / output connections. Power (+5V) is supplied to the

Encoder PCB from the Transmitter PCB on PL1-1 and ground is PL1-7.

12. The Encoder PCB also contains circuitry for the signal conditioning of the audio/speech

input to the Serial Encoder. PL2 on the Encoder PCB is for factory test purposes only.