Installation
025-9416
67
•
combination (local and remote transmitters)
The following subsections overview the basic connections between the Model 640 and a variety
of common RF equipment — transmitters, controllers, and link equipment.
Modifications For TTL Data Outputs
In some system applications, RS-232 data output levels are not desired for the radio station
connections. If either the DIG DATA (pin #42) or the DIG MODE (pin #14) signals need to be
pulled down for TTL data, insert the simple circuit shown in Figure 29 between the Model 640
output and the transmitter input.
+5V
TTL level
output to
transmitter
3.3k
Ω
¼W
10k
Ω
¼W
Data output
from Model
640
Figure 29. RS-232 to TTL Data Level Conversion
RF Station Jumper Settings
The Model 640 uses jumper settings and potentiometer adjustments to provide the needed radio
station output flexibility. The jumpers on the peripheral motherboard control RF broadcast
station interface parameters.
Note:
Improper jumper settings can result in pager decoding errors or poor audio quality.
Figure 30 shows the locations of each jumper on the peripheral processor circuit board.
JP10
JP8
a
b
JP7
JP
b
a
JP5
b
a
Front of
Model 640
Chassis
⇒
JP4
b
a
JP3
JP6
b
a
JP2
b
a
JP
1
a
Figure 30. Peripheral Board Jumper Locations (Top View)
Summary of Contents for 640 DAPT XTRA
Page 2: ......
Page 6: ...Statements vi 025 9416...
Page 20: ...Introduction 8 025 9416...
Page 26: ...Specifications 14 025 9416...
Page 96: ...Installation 84 025 9416...
Page 126: ...Optional Equipment Installation 114 025 9416...
Page 134: ...Voice Prompts 122 025 9416...
Page 174: ...Parts Lists and Schematics 162 025 9416 Schematic...
Page 175: ...Parts Lists and Schematics 025 9416 163...
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Page 182: ...Parts Lists and Schematics 170 025 9416 Silkscreen...
Page 185: ...Parts Lists and Schematics 025 9416 173 Schematic...
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Page 196: ...Parts Lists and Schematics 184 025 9416 Silkscreen...
Page 198: ...Parts Lists and Schematics 186 025 9416 RAM Disk 702 9386B ROM Disk 702 9389B...
Page 199: ...Parts Lists and Schematics 025 9416 187 TNPP Interface 702 9362C 2...
Page 200: ...Parts Lists and Schematics 188 025 9416 Terminal Block Adapter 702 9470B...
Page 201: ...Parts Lists and Schematics 025 9416 189 CONFIGURATION DIAGRAMS Dual Trunk Telco DID 024 0076A...
Page 202: ...Parts Lists and Schematics 190 025 9416 Dual Trunk Telco End to End 024 0077A...
Page 203: ...Parts Lists and Schematics 025 9416 191 Dual Trunk Telco E M 024 0078A...
Page 204: ...Parts Lists and Schematics 192 025 9416 Dual Trunk Telco Ground Start 024 0079A...
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