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Electrical Interfaces
Table 5-15. Asynchronous Interface - 9-Pin Female "D" Connector (J18)
Pin Number
1
TX-485-B
2
TXD-232
3
RXD-232
5
GND
4
NC
9
RX-485-A
8
RX-485-B/CTS
6
TX-485-A
7
RTS
5.4.17 TX DC VOLTAGE INDICATOR
The Transmit DC Voltage Indicator shows if there is DC Voltage present at J2.
5.4.18 RX DC VOLTAGE INDICATOR
The Receive DC Voltage Indicator shows if there is DC Voltage present at J1.
5.5 Async Port Configuration Switches
The switch settings listed below in Tables 5-16 through 5-19 are used to configure the Async Port
for the following applications. The DIP Switches are located on the inside of the unit on the
Async Card with the exception of the AS/3771 Daughter Card (discussed below). The user must
remove the top cover of the unit to access these switches.
5-18
DMD2401 LB/ST L-Band Satellite Modem and ODU Driver
Signal
Transmit Data RS485 (+)
Transmit Data RS232
Receive Data RS232
Ground
Not Connected
Receive Data 485 (-)
Receive Data 485 (+)
Transmit Data 485 (-)
Request to Send
Description
Direction
Input
Input
Output
–
–
Output
Output
Input
Input
TM075 – Rev. 1.3
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