Pin Signal
A     Channel 1{4} IN +
B     Channel 1{4} IN -
C     Channel 2{5} IN +
D     Channel 2{5} IN -
E     Channel 3{6} IN +
F     Channel 3{6} IN -
G     Calibration OUT
H     Calibration GND
J     Power OUT, + 12 Volt (battery raw voltage)
K     Power OUT, GND
Mating Connector: [MIL-C-26482] 12-10P

Pin Signal
A     Aux IN 1
B     Aux IN 2
C     Aux IN 3
D     GND
E     Digital OUT (open coll.)
F     Digital OUT (TTL)
G    Aux IN 4
Mating Connector: [MIL-C-26482] 10-07P

Pin     Signal     line to PC-COM     Pin
A          DCD/                      ---                    1
B          DSR/                      ---                    4
C          RX                           ---                    3
D          RTS/                       ---                    8
E          TX                            ---                    2
F           CTS/                      ---                    7
G          DTR                        ---                    6
H          RI                            ---                    9
J          GND                        ---                    5
K          Terminal              ---                     Bridge to Pin 5 (don't connect before requesting GFZ pool staff)
Mating Connector (Recorder): [MIL-C-26482] 12-10S
Mating Connector (PC only !!): D-Sub 9-pin, female

NOTE: The wiring given above is designed for connecting Earth Data Logger to a MODEM.

For an intermediate access to the 'MODEM' port  by a PC or PDA remove connections between Pin A and Pin 1 as well as between Pin G and Pin 6, and apply bridges between Pin A and Pin G as well as between Pin 1 and Pin 6 (shortcut DTR and DCD).

Pin     Signal               Pin (COM)
A         IN +
B         IN -
C         OUT +
D         OUT -
E         Digitiser RX         3
F         Digitiser TX          2
G        Digitiser GND      5
Mating Connector (Recorder): [MIL-C-26482] 10-07S
Mating Connector (PC): D-Sub 9-pin, female

- certain recorders only

Pin Signal
A      VBUS
B      D -
C      D +
D      GND/Shield
Mating Connector: [MIL-C-26482] 08-04P

Pin           Signal
pin            Antenna +
shield      Antenna -
Mating Connector: BNC, male

Pin   Signal
A        Power IN, +12 Volt
B        Power OUT (500 mA fused)
C        NC
D        GND
Mating Connector: [MIL-C-26482] 08-04S

CENTRONICS          IDE     HD Power
Pin   Signal             Pin     Pin
I          HD_LED         39
26      GND                  ---        2/3
2         HD_CS0          37
27       HD_CS1         38
3         HD_Addr0     35
28       HD_Addr2     36
4         HD_Addr1     33
29       VCC                  ---        4
5          IRQ(14)          31
30       IO_16              32
6         VCC                  ---        4
31       GND                40
7          IO_RDY          27
32       DD_ACK         29
8          IO_Read        25
33       GND                30
9         IO_Write        23
34       GND                26
10       GND                24
35       GND                22
11       GND                19
36       DD_RQ           21
12       Data0             17
37       Data15           18
13       Data1             15
38       Data14           16
14       Data2             13
39       Data13           14
15       Data3             11
40       Data12           12
16       Data4              9
41       Data11           10
17       Data5             7
42       Data10           8
18       Data6             5
43       Data9             6
19       Data7             3
44       Data8             4
20       Reset IDE      1
45       GND                2
21      (SLAVE+)
46       Disk Heating
22
47       Disk Heating
23
48       (SLAVE-)
24
49
25
50       GPIO_Detect   34
Mating Connector (to Hard Disk Case): Centronics [IEEE488] 50-pin, female
Mating Connector (to IDE Controller): IDE Connector, 40-pin, female