SECTION б - INSTALLATION
COMPUTER OR CRT HOOKUP
Proper installation of the Model 16 requires a CRT or personal computer.
This gives the Installer, and later the System Operator, a means of
displaying parameters on a screen and a keyboard for entering new values.
With this setup the Installer gains access to some helpful Test modes and
the System Operator gets an entry station for Programming access and
Paging.
The computer or CRT requirement can be satisfied by any one of the
following:
a)
A "dumb" CRT with a serial I/O connector
b)
A personal computer, with serial I/O connector, that runs a
"terminal emulation" program. Such programs are available for
most computers; Zetron has one available for the IBM PC.
Computer Serial I/O Connection
Serial I/O connection to the Model 16 is made via the 9-pin D style
connector J1 at the back of the Paging Terminal. Typically only three
wires need be connected from J1 to the 25 pin connector used on most
computers and CRTs. The CRT should be set for 9600 baud, 8 data bits,
1 stop bit, no parity bit, and full duplex.
MODEL 16 SIGNAL
PIN
CRT SIGNAL
PIN
Transmit Data
Jl-3
Received Data
3
Received Data
Jl-4
Transmit Data
2
Ground
Jl-5
Ground
7
RECEIVER
Only one signal is necessary from the receiver, the COR. Carrier Operated
Relay or Channel Busy is an indication that will inhibit the Model 16 from
keying the transmitter when the radio channel is in use by another party.
COR must be available whenever a channel is shared with other transmitters.
Functionally the Channel Busy and the Terminal Busy (described below)
inputs of the Model 16 are the same and no distinction is made between
them. An inhibit signal at either input will prevent the Model 16 from
keying the transmitter. There is a single programmable Channel Busy time
value that applies to both inputs; it determines how long the Model 16
will wait from the loss of the last inhibit signal before keying the
transmitter.
Channel Busy (COR)
The source for this signal is usually derived from Receiver Squelch
and indicates that modulation is present on the channel. The Model 16
needs either a relay contact closure between pins 6 and 5 of J2 or a
signal applied to pin 6 of J2 which changes from a high to a low
level (or vice versa) whenever a "Busy" signal is present.
6-3
