Operation
Operating Instructions MT-xx6-A
R. STAHL HMI Systems GmbH / OI_MT_xx6_A_en_V_03_00_26.docx / 03.11.2020
Page 35 of 60
13.2.1
Dip switch settings S3 and S4
Switch
Position
Interface
Function
S3-1
OFF
COM1
RS-422/485
No bus terminator resistor set
ON
Bus terminator resistor TxD line
S3-2
OFF
No bus terminator resistor set
ON
Bus terminator resistor RxD line
S4-1
S4-2
S4-3
Interface
Keying
0
0
0
RS-422
Automatic keying
0
1
0
Keying always on
0
0
1
Keying enabled by SW
0
1
1
Driver in idle mode
1
0
0
RS-485
Automatic keying
1
1
0
Status not permitted !!!
1
0
1
Keying enabled by SW
1
1
1
Driver in idle mode
S4-4
OFF
Touch
Without function
ON
13.2.2
Status LEDs
The status of the respective LEDs at the HMI devices indicates the activity of the corresponding
data lines.
These LEDs are located underneath the additional back lid that covers the interface circuit
board. This additional back lid needs to be removed in order to see these LEDs.
In hazardous areas the HMI device must not be operated without the
housing lid !
The status LEDs can therefore only be observed at the first start-up
or in safe areas.
13.2.2.1
LEDs
Definition
Colour Name
Description
LD5
green
COM1 TxD
Activity on COM1: sending, LED flashing
LD8
yellow
COM1 RxD
Activity on COM1: receiving, LED flashing
LD7
green
COM2 TxD
Activity on COM2: sending, LED flashing
LD6
yellow
COM2 RxD
Activity on COM2: receiving, LED flashing
LD14
yellow
LINK ACT
Ethernet link established, LED always on
Activity on Ethernet link, LED flashing
LD15
green
HD
Access to system disk (Solid State, HDD),
LED flashing
(only for MT-4x6-A-* devices)
CAUTION
