Instruction manual
Installation
025-9416 61
Note: It is important to remember that pin #1 for a 6-pin jack does not correspond to pin #1
for an 8-pin jack. See the wiring configurations in Figure 25.
q
3. Trim any excess wire from each punchdown terminal to ensure good electrical
contact.
q
4. Label the punchdown block to identify each of the leads. This will simplify trouble-
shooting and repair later.
Telco connections for the optional RJ66M425 punchdown block are complete.
RADIO STATION CONNECTIONS
As described earlier under “TELCO CONNECTIONS” on page 51, the male 50-pin RJ21
connector on the rear of the Model 640 provides both trunk and radio station interfaces for the
paging terminal. This subsection details radio station installation for each type of connection
available. Use only the instructions that apply to the interface method (terminal block adapter or
punchdown block) already chosen for connections to the telco.
There are basically two interface options available for separating out the telco and radio connec-
tions. Each method of installation can be modified in an endless variety of ways for a custom
application. The two unique hardware interfaces are:
• Zetron’s optional installation interface assembly (Part No. 950-9334)
• A female to male 50-pin interface cable (Part No. 709-0004) and a 66-type punch-
down block (Part No. 802-0093 or 802-0263).
Figure 26 shows the pin configuration for the radio station and telco interface connector on the
rear of the Model 640.
pin 50pin 26
pin 1
pin 25
Figure 26. 50-pin Radio Station and Trunk Interface
Table 9 shows the radio station pinouts for the RJ21 connector. This information is also printed
on the rear panel of the paging terminal for convenience.
Notes on Table 9:
†Relay contacts rated to 30 V
AC/DC
, 1 amp or 120 V
AC
, 0.5 amp.
* TTL, RS-232, CMOS levels: (Unless indicated otherwise, signal is compatible with all three levels)
TTL: OFF = 0 V
DC
to 0.8 V
DC
ON = +2.4 V
DC
to +5.0 V
DC
RS-232: OFF = -3 V
DC
to -12 V
DC
ON = +3 V
DC
to +12 V
DC
CMOS: same as TTL, except no pull-up resister load