EMBRON Hatteland HD 12T21 MMC Series, User Manual

Page: 59 / 124

Specifications - NMEA / IEC COM Module RS-422 / RS-485
PCA200828-1
59
IND100129-263
SPECIFICATIONS
Note: All specifi cations are subject to change without prior notice!
Please visit www.hattelandtechnology.com for the latest electronic version.
2/2
3/4
5-pin Isolated NMEA COM
“RS-422/RS-485”
5 4 3 2 1
PIN 01 TxD- Transmit Data Negative
PIN 02 TxD+ Transmit Data Positive
PIN 03 GND Isolated Ground
PIN 04 RxD- Receive Data Negative
PIN 05 RxD+ Receive Data Positive
*Pin 1,2,3,4=RS-422/485 Full Duplex (4-wire)
*Pin 1+4, 2+5 = RS-485 Half Duplex (2-wire)
Connect TxD and RxD pair-wise:
TxD- to RxD-, TxD+ to RxD+.
Note: Confi guration of options for ECHO of
transmitted data and to force the transmitter to
always active is available in BIOS.
RS-422 / RS-485 FULL DUPLEX
120Ω
DE (Data Enable)
External Device
Termination Ω
at end of cable
External Device
TX
TX
RX
RX
120Ω
Termination Ω
at end of cable
120Ω
120Ω
Termination Ω
at end of cable
Termination Ω
at end of cable
TX
External Device
TX
External Device
RX RX
Pin 1: TxD- (Z)
Pin 2: TxD+ (Y)
Pin 5: RxD+ (A)
Pin 4: RxD- (B)
1 1
1
2 2
2
4
4
4
5
5
5
*
Note: 120Ω termination on TX pins are rarely needed, unless cable is long or enviroment is very noisy.
*
COM Ports are identifed in the Operating System
(example Microsoft ® Windows ® 10) as:
A = COM6, B = COM7, C = COM8, D = COM9.
(COM ports are not reserved nor locked by BIOS. COM Port numbering may
differ depending on OS used and customized solutions. Use the Operating
System functions to determine actual port numbering, if problems arise).
Our units are based on an isolated RS-485 interface with enhancements to
meet NMEA standard. It is recommended connecting the ground wire since it
will help protect the system in event of fast transient voltage and most likely
also help improve signal integrity in the system.
For slow changing or DC offset our system will most likely work without the
ground wire. If this wire is not connected, our units are more sensitive to fast
transient voltage at the connectors. (The “isolated Ground” wire will help
absorb this energy).