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Rear Panel Interfaces
5.4 External Reference (Input)
The External Reference Input (J3) is supplied to allow the customer to phase-lock the modulator's
internal oscillator to an external reference.
This female BNC Connector accepts a 1.5 – 5 Vp-p @ 50 Ohms. The frequency range of the
external reference is 1 – 10 MHz in 8 kHz steps.
5.5 Remote Port (I/O)
The Remote Port Interface (J4) can be used for the monitor & control functions of the unit. The
physical interface is a female 9-Pin D-Sub Connector. This bi-directional port complies with
RS-485 Electrical Specifications. Refer to Section 7.6 for protocol and programming details.
Pinouts are listed in Table 5-1.
Table 5-1. J4 - RS-485 Remote Control- 9-Pin 'D' Female
Pin No.
1
5
6
8
9
5.6 Terminal Port (I/O)
The Terminal Port Interface (J5) can be used for the monitor & control functions of the unit. The
physical interface is a female 9-Pin D-Sub Connector. This bi-directional port complies with
RS-232 Electrical Specifications. Refer to Section 4.6 for terminal interface details. The pinouts
are listed in Table 5-2.
Table 5-2. J5 - RS-232 Terminal Port - 9-Pin 'D' Female
Pin No.
Signal Name
3
2
5
7
8
5.7 Alarm Port
The Alarm Connector (J6) is used to indicate the fault condition of the modulator to external
equipment. This male 9-Pin D-Sub Connector provides connection to two Form-C relays and an
open collector output. The user can distinguish between major and minor alarms with the relays.
Refer to Table 5-3 for connector pinouts. Table 5-4 below describes the alarm indications.
5-4
Signal
Tx (B)
GND
Tx (A)
Rx (B)
Rx (A)
TxD
RxD
GND
RTS
CTS
DM240-DVB High-Speed Digital Modulator
Description
Transmit Data (+)
Ground
Transmit Data (-)
Receive Data (+)
Receive Data (-)
Description
Transmit Data
Receive Data
Ground
Request to Send
Clear to Send
Direction
Output
---
Output
Input
Input
Direction
Output
Input
---
Output
Input
TM083 - Rev. 3.0
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