Interfaces; Data Interface (Db-25) - GE MDS TD220MAX Manual

TD220MAX_manual_v11.doc

3 Interfaces

3.1 Data Interface (DB-25)

The Data Interface has several ports integrated into one connector: Ethernet, COM1 and COM2
Serial Ports, and GPS signaling. Note that COM3 is connected internally and therefore not available
on pins labeled with "COM3."
DB-25
Signal
Pin
1 COM3_DCD
2 COM2_TXD
3 COM2_RXD
4 COM2_RTS
5 COM2_CTS
6 COM3_TXD
7 GND
8 COM2_DCD
9 COM3_CTS
10 COM3_RTS
11 COM3_DTR
12 COM3_RXD
13 GND
14 ETH_TX_H
15 ETH_TX_L
16 ETH_RX_H
17 ETH_RX_L
18 EXT_KEY
19 EXT_DET
20 COM2_DTR
21 ALARM_OUT
22 GPS_PPS_L
23 GPS_PPS_H
24 COM1_RXD
25 COM1_TXD
The DB-25 connector is female, and the orientation of the connector as looking into the front panel
of the unit is as shown below.
13 12 11 10 9 8
25 24 23 22 21
05-6906A01
Direction WRT MDS
Equipment
Input
Input
Output
Input
Output
Output
Input/Output
Output
Input
Output
Output
Input
Input/Output
Output
Output
Input
Input
Output
Input
Input
Output
Input
Input
Input
Output
7 6 5 4 3 2
20 19 18 17 16 15
Page 6 of 49
Notes
Reserved
GPS NMEA Data Expected
Reserved
Used for aggregated alarm output, negative
voltage = no alarm, 0 voltage = radio off,
positive voltage = ALARM PRESENT. RS-232
Levels.
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Not Connected
TTL level 1PPS signal input. 0 to 5 VDC nominal.
Console
Console
1
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7/31/2014