AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
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Section Four:
Serial Communications
The CRT terminal has a blank screen with a blinking cursor but does not display
any information.
Corrective Action:
1) Verify that the CRT has 120 VAC connected and is turned on.
2) Verify that the SIB to DIB ribbon cable is installed.
3) Verify that the EIA-232 wiring from the Serial Interface Board is plugged in to
the correct port on the CRT.
4) Check the EIA-232 connections from the Serial Interface Board to the CRT.
5) Check the setup programming of the CRT. If the programming is correct, try
moving the CRT to the panel and connecting it to the SIB with a short length
of cable. If it still does not function, replace the CRT.
The AM2020/AFP1010 is not receiving the proper "handshaking" signal from the
CRT terminal.
Corrective Action:
1) Confirm that the CRT has power and has been turned on.
2) Verify that the EIA-232 connection is plugged into the correct port on the CRT.
3) Verify the EIA-232 wiring.
4) Check the setup programming on the CRT. Compare the programming to that
shown in the AM2020 Manual.
5) Replace the CRT.
Figure 4-1: Connecting the EIA-232 to the CRT.
SIB P3-9
SIB P3-10
SIB P3-12
DB-25 Pin 7
DB-25 Pin 3
DB-25 Pin 2
CRT Terminal Does Not
Display Any Data.
The CRT Displays
Information but Does
Not Transmit Any Key-
board Input Back to the
Panel.
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