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DB-25
Signal
Pin
1
Not Connected
2
COM2_TXD
3
COM2_RXD
4
COM2_RTS
5
COM2_CTS
6
Not Connected
7
GND
8
EXT_ALARM
9
Not Connected
10
Not Connected
11
Not Connected
12
Not Connected
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
Not Connected
22
GPS_PPS_L
23
GPS_PPS_H
24
COM1_RXD
25
COM1_TXD
Adapter Board
3.6.1
GE MDS has available a breakout adapter board that separates the DB25 connector into an Ethernet
port, PPS port, as well as three COM connectors. This board is for controlled environment applications
only. For additional details regarding the adapter board, view the "TD_RCL" adapter board instruction
sheet located here http://www.gegridsolutions.com/app/resources.aspx?prod=td-series&type=9.
8
Table 4. DB25 Serial Interface Pinouts
Direction WRT MDS
Equipment
N/A
Input
Output
Input
Output
N/A
Input/Output
Output
N/A
N/A
N/A
N/A
Input/Output
Output
Output
Input
Input
Output
Input
Input
N/A
Input
Input
Input
Output
TD220MAX Technical Manual
Notes
Reserved
GPS NMEA Port
GPS NMEA Port
GPS NMEA Port
GPS NMEA Port
Reserved
Ground
See External Alarm Sense in section 5.3
Reserved
Reserved
Reserved
Reserved
Ground
Ethernet
Ethernet
Ethernet
Ethernet
Reserved – Power Amplifier
Reserved – Power Amplifier
GPS NMEA Port
Reserved
Not Connected
TTL level 1PPS signal input. 0 to 5 VDC nominal.
Console
Console
MDS 05-6906A01, Rev R
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