Specifications

CES SUPPORT 407-679-9440 Page 8 MAN79 © CES 2009

2.5 Component Layout

Fig.2.0

U6 U3

J3 J2

SW1SW2

R6 9

R4 0

R3 7 R2 5

R2 4

JP1

JP3

JP4

JP5

JP7

JP8

JP2

JP6

TP1

TP2

TP3

TP4

RM-20 BOARD LAYOUT

2.6 Radio Interface Connection

Pin Function Signal Description

1 PTT, NO --------------- PTT relay, normally open

2 PTT, NC --------------- PTT relay, normally closed

3 AUX. COMMON --------------- Auxiliary relay, common

4 TX DISABLE Input -35 to 35 volts, switch @ 2.5v, 47k pull up to 12v

5 TX CTCSS Output CTCSS Output to Transmitter

6 TX AUDIO Output Transmit (Repeat) audio to Transmitter

7 RX AUDIO Input Receive audio from Receiver

8 GROUND --------------- Ground

9 PTT, COMMON --------------- PTT relay, common

10 AUX. NO --------------- Auxiliary relay, normally open

11 AUX. NC --------------- Auxiliary relay, normally closed

12 NO CONNECTION

13 COR (Channel Busy) Input -35 to 35 volts, switch @ 2.5v, 47k pull up to 12v

14 GROUND --------------- Ground

15 12 VOLTS Input Fused & reverse polarity protected