8
TD220MAX Technical Manual
MDS 05-6906A01, Rev R
Table 4. DB25 Serial Interface Pinouts
DB-25
Pin
Signal
Direction WRT MDS
Equipment
Notes
1
Not Connected
N/A
Reserved
2
COM2_TXD
Input
GPS NMEA Port
3
COM2_RXD
Output
GPS NMEA Port
4
COM2_RTS
Input
GPS NMEA Port
5
COM2_CTS
Output
GPS NMEA Port
6
Not Connected
N/A
Reserved
7
GND
Input/Output
Ground
8
EXT_ALARM
Output
See
External Alarm Sense
in section 5.3
9
Not Connected
N/A
Reserved
10
Not Connected
N/A
Reserved
11
Not Connected
N/A
Reserved
12
Not Connected
N/A
Reserved
13
GND
Input/Output
Ground
14
ETH_TX_H
Output
Ethernet
15
ETH_TX_L
Output
Ethernet
16
ETH_RX_H
Input
Ethernet
17
ETH_RX_L
Input
Ethernet
18
EXT_KEY
Output
Reserved
– Power Amplifier
19
EXT_DET
Input
Reserved
– Power Amplifier
20
COM2_DTR
Input
GPS NMEA Port
21
Not Connected
N/A
Reserved
22
GPS_PPS_L
Input
Not Connected
23
GPS_PPS_H
Input
TTL level 1PPS signal input. 0 to 5 VDC nominal.
24
COM1_RXD
Input
Console
25
COM1_TXD
Output
Console
3.6.1
Adapter Board
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
.
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