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Electrical Interfaces
Table 5-32. Asynchronous Interface - 9-Pin Female "D" Connector (J17)
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
5.9 Async Port Configuration Switches
The switch settings listed below in Tables 5-33 through 5-37 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 and the AS/4803 Universal Daughter Card
(discussed below). The user must remove the top cover of the unit to access these switches.
Table 5-33. Async Port DIP
Switch Settings – RS-485
Only
1
OFF
2
OFF
3
OFF
4
OFF
5
OFF
6
Table 5-35. Async Port DIP
Switch Settings – RS-232
Only with CTS & RTS
1
2
3
OFF
4
OFF
5
6
OFF
5-34
DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
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
Table 5-34. Async Port DIP
Switch Settings – RS-232 or
ON
Table 5-36. Async Port DIP
Switch Settings – RS-232
ON
ON
ON
Description
RS-485
1
ON
2
ON
3
OFF
4
OFF
5
OFF
6
ON
Null or RS-485
1
OFF
2
OFF
3
ON
4
ON
5
OFF
6
ON
Direction
Input
Input
Output
–
–
Output
Output
Input
Input
TM065 – Rev. 3.3
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