Hatteland HD 12T21 MMC Series, User Manual, Page: 52 / 112

Specifications - NMEA / IEC COM Module RS-422 / RS-485
PCA100293-1
52
IND100129-138
SPECIFICATIONS
Note: All specifi cations are subject to change without prior notice!
Please visit www.hatteland-display.com for the latest electronic version.
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Please note:
- By standard factory default, all of the jumpers on all channels are set to open (no jumper), except some customized models as per request.
- It is expected that the user has the required knowledge for working with PCB Cards, electronics and setting jumpers.
- To avoid voiding warranty, please contact us prior to ordering to ensure safe and correct configuration regarding ECHO in factory.
- Incorrect setting of these jumpers can cause strange data losses/corruption which are hard to debug in software.
There are 2 jumpers for each channel (physically they are located as A,B,D,C as indicated below). You will have to provide suitable 2mm jumpers
(not part of any delivery) See illustration below showing internal PCB card.
Forced TX(x):
If this jumper is set it will enable the RS485 transmitter for channel X at all times. It can be useful when the end user need the transmitter to
remain on at all times. Note that it is only possible to use one transmitter on the bus when this jumper is set. It will force the bus to a logic high
state when there is no traffic. Power consumption is increased if this jumper is set since the termination resistor always see the full output voltage.
No ECHO(x) - NOTE: Required for some MODBUS Compability.
Jumper mounted: This setting is only to be used during half duplex communication. When this jumper is set it will disable ability to receive data
(Echo of transmitted data) while transmitting is active. Some software libraries are not able to use echo and therefore need this jumper set.
Typically example is a very common MODBUS library.
Jumper open (no jumper): Recommended setting. All data sent on the bus is read back and the application/driver on the computer can check that
we was able to send the data onto the bus.
Isolation:
This only apply to the module in itself, the internally mounted units are most likely less isolated due to cable/connectors used.
Jumper Configuration:
Users who needs to open the unit set jumper settings will VOID THE WARRANTY!
Before opening, proper ESD measurements must be taken!
1. Operator should ground himself by using a wrist band.
2. The wrist band should be connected to ground via a ground cord.
3. A one megaohm resistor, installed in the wrist connection end of the ground cord, is a safety requirement.
4. Hatteland Display recommend to use an Static-dissipative ESD work mat positioned at the workplace. The 3M™ 8501 Portable Field Service Kit is a
good choice for this purpose. Make sure that the mat, operator and product is wired/grounded together.
All assisting persons who might come into contact with the endangered boards must also use the ESD equipment.
CAUTION
This unit contains electrostatic sensitive devices.
Observe precautions for handling.
Jumper Locations (top view) - General illustration:
Forced TX(C)
No Echo(C)
Forced TX(D)
No Echo(D)
Forced TX(B)
No Echo(B)
Forced TX(A)
No Echo(A)
2 x Terminal Block 5-pin rows
(MC 1,5/ 5-STF-3,81)
Released