Instruction manual
Installation
62 025-9416
Table 9. RJ21 Radio Station Pin Configuration
Pin # Label Description
13
38
REC AUDIO HI
REC AUDIO LO
Receives audio (600 ohm balanced) input from radio station.
Transformer-coupled audio for talkback (2-way) paging applications.
14 DIG MODE Output (RS-232 voltage level*) keys up transmitter in digital mode.
15
40
XMIT AUDIO HI
XMIT AUDIO LO
600 ohm balanced audio output to transmitter (tone, voice, modem).
16 COR / CAS
Input from radio station indicating channel busy. COR inhibits transmis-
sion until “clear.” Usually connected to radio COR or CAS output signal.
Can be used as analog clear to send (CTS) input from a transmitter link
controller. *
17 GROUND Signal ground, used with signals 14, 39, 16, 41, 42, 21, 22, 46, 47. Not
the same as chassis ground (pins #49, 50).
18
19
43
ANA PTT COM
ANA PTT NC
ANA PTT NO
Outputs (common, normally open, normally closed) indicate analog
paging audio is being sent to the transmitter. Can be used as analog
request to send (RTS) outputs to a transmitter link controller. †
20
44
45
DIG PTT COM
DIG PTT NC
DIG PTT NO
Outputs (common, normally open, normally closed) indicate digital paging
data is being sent to the transmitter. Can be used as digital request to
send (RTS) outputs to a transmitter link controller. †
21
22
46
47
ZONE ADR 8
ZONE ADR 2
ZONE ADR 4
ZONE ADR 1
Outputs indicate, along with XMIT REQUEST, whether the selected radio
RF paging zone is “clear” or “busy”. The zone address is coded in binary
bits 8 (2
3
), 4 (2
2
), 2 (2
1
), 1 (2
0
). (For example, 8=ON, 4=OFF, 2=OFF,
1=ON corresponds to zone #9 (1x2
3
+ 1x2
0
). Each signal requires a pull-
up resistor to 5 volts, able to sink 40 mA to signal ground to drive relays
or a transmitter link controller. Signal between 0 and 0.8 V is equivalent
to a logic 1 (ON).
23
24
48
AUX PTT NO
AUX PTT COM
AUX PTT NC
Auxiliary outputs (common, normally open, normally closed) activate after
XMIT REQUEST and before ANA or DIG PTT. Useful to busy out other
control equipment sharing the transmitter. †
39 XMIT REQUEST Output requesting radio transmission. RS-232 voltage level compatible. *
41 BUSY
Input from other paging equipment sharing the transmitter. Inhibits the
Model 640 from keying PTT. Paging terminal stops transmitting at end of
paging batch if busy asserted. Can be used as digital clear to send (CTS)
input from a transmitter link controller. *
42 DIG DATA
Output carries binary digital paging data. RS-232 voltage level
compatible. *
49, 50 GROUND Connected to protective chassis ground for cable shielding and RFI
protection. Not the same as signal ground (pin #17).
Installation Interface Assembly
The optional installation interface assembly (Part No. 950-9334) provides two male, 12-pin,
Wiedmueller connectors for radio station interface (separate analog and digital). If the assembly
is being used for the RJ21 interface, it should have been installed already and connected to the
telco.