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TV/STB RS-232 Monitor Requirements / RS-232 Troubleshooting
RS-232 Communication Requirments
RS-232 Pin Configuration Wiring Diagram
of the TV/STB Display Control Connector
Type of Connector; D-Sub 9-Pin Female
No.
Pin Name
1
No Connection
2
TXD (Transmit data)
3
RXD (Receive data)
4
No Connection
5
GND
6
No Connection
7
No Connection
8
No Connection
9
No Connection
Monitors listed below require RS-232 Null Modem DB9 Cable
with male connectors at each end. Depending on the type of
Null modem cable, one or two gender changers may be required.
RS-232C Null Configuration
3-Wire Configuration
(Serial male-male NULL modem cable)
TV/STB
NC
1
TXD
2
RXD
3
NC
4
GND
5
Null-Modem
NC
6
Cable
NC
7
NC
8
NC
9
D-Sub 9-pin
Male
RS-232 Troubleshooting
Improper RS-232 Communications Setup
- Selects Incorrect Source at Power Up
TV/STB powers On TV. Flashes selected HDMI/DVI source but
selects incorrect Aux source.
- Check settings for Installer menu items 108, 109, 110 and 113.
P A G E 6 4
Monitor
Monitors:
1
NC
M3200C
2
TXD
M3700C
3
RXD
M4200C
4
NC
M4600C
5
GND
M3201C
M3701C
6
NC
M4201C
NC
7
M4210C
NC
8
NC
9
D-Sub 9-pin
Male
5
2
1
3
4
Monitors listed below require RS-232 straight-through (extension)
DB9 cable with male connector on one end and female
connector on the other end.
Refer to monitor installation guide for more specifics.
RS-232C Straight Configuration
3-Wire Configuration
(Straight-through male-female cable)
TV/STB
NC
1
TXD
2
RXD
3
NC
4
GND
5
Straight-Through
NC
6
or Extension
NC
7
Cable
NC
8
NC
9
D-Sub 9-pin
Male
- Displays 'No Signal' message at Power Off
TV/STB does not power Off TV and displays 'No Signal' message.
- Check settings for Installer menu items 108, 109, 110 and 113.
Monitor
Monitors:
1
NC
20LS7DC
2
RXD
26LC7DC
3
TXD
23LS7DC
4
GND
32LC7DC
5
NC
37LC7D
42LC7D
6
NC
47LC7DF
NC
7
32LC2DC
NC
8
37LC2DC
NC
9
50PC5DC
50PM1M
D-Sub 9-pin
MU-60PZ95V
Female
71PY1M
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Table of Contents
Troubleshooting
