MTD 860 Series Datasheet download pdf (Page 9)

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Figure 2-5. Pin-out of RJ45 - looking into the socket.

Pin Signal Notes

1 Ground Ground

2 +8 to 30V DC

Power supply input (Note: directly

connected to Pin 2 on the right RJ45

socket)

3 HSO1 Handshake output MDT serial port 1

4 TxD1 Data output from MDT serial port 1

5 RxD1 Data input to MDT serial port 1

6 HSI1 Handshake input to MDT serial port 1

7 A RS485 bus A - serial port 0

8 B RS485 bus B - serial port 0

Table 2-2. Pin-out of left RJ45 socket - viewed from front.

Pin Signal Notes

1 Ground Ground

2 +8 to 30V DC

Power supply input (Note: directly

connected to Pin 2 on the left RJ45

socket)

3 HSO0 Handshake output MDT serial port 0

4 TxD0 Data output from MDT serial port 0

5 RxD0 Data input to MDT serial port 0

6 HSI0 Handshake input to MDT serial port 0

7 A RS485 bus A - serial port 0

8 B RS485 bus B - serial port 0

Table 2-3. Pin-out of right RJ45 socket - viewed from front.

2.6.2 Keyboard interface

The MDT-860 provides an interface to an external standard PC/AT keyboard. This

connection is provided through the RJ12 connector (left side connector when viewed from

the front).

The keyboard processing is provided by the sub processor (Atmel AVR ATtiny2313

microcontroller), which communicates with the main processor (M16/62P) via an internal

serial data connection.

Keyboards may be connected and disconnected during operation. The sub processor will

re-establish communication with keyboards each time it is reconnected without the need to

reset the MDT-860.

There is a maximum current limitation of 100mA for any keyboard connected to the MDT-

860.

Figure 2-6. Pin-out of keyboard RJ12 - looking into the socket.

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MTD 860 Series Datasheet Page 9