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Appendix B:Port Pinouts And Cable Diagrams
8255/60 Peripheral Port I/O Connector
(28-Pin PCR)
B-2
Teklogix 7035, 8255 & 8260 Terminals User Manual
B.2 8255/60 Peripheral Port I/O Connector
(28-Pin PCR)
Scanner
Power
17
5V_SCAN_PWR
5 V scanner power (duplicate of pin 18).
18
5V_SCAN_PWR/TX_KEY
5 V scanner power/transmit monitor
signal for radio test.
19
EXP0
Expansion 0.
20
CV_OUT
Control voltage output.
Radio
Test
21
EXP1
Expansion 1.
22
EXP2
Expansion 2.
23
EXP3
Expansion 3.
24
EXP4
Expansion 4.
Serial
Port 1
(COM1)
25
RTS1
Request-to-send (output) RS-232D.
26
CTS1
Clear-to-send (input) RS-232D.
27
SERIAL1_TX
Serial transmit data RS-232D.
28
SERIAL1_RX
Serial receive data RS-232D.
Function Pin
Signal Name
Description
Ground
1
GND
Digital ground.
2
GND
Digital ground.
Audio
3
MIC
Microphone input.
4
LINE_OUT
Line level audio output
Alarm
5
BEEP
External beeper output.
EMI
Shield
6
SHIELD
Digital ground.
Diagnos-
tic Mode
7
DIAG
Input. If grounded at power up, causes
terminal to enter diagnostic mode. Menu
allows flash-ROM upgrade and other test
modes.
Function Pin
Signal Name
Description
Содержание Vehicle-Mount Computer 8255
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