EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title "Logic level serial to RS485"
Date "2020-07-31"
Rev "1.0"
Comp "Copyright (c) 2020 Michael Buesch <m@bues.ch>"
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Interface_UART:MAX485E U3
U 1 1 5CB8D683
P 6200 2050
F 0 "U3" H 5950 2550 50  0000 C CNN
F 1 "MAX485E" H 6450 2550 50  0000 C CNN
F 2 "" H 6200 1350 50  0001 C CNN
F 3 "https://datasheets.maximintegrated.com/en/ds/MAX1487E-MAX491E.pdf" H 6200 2100 50  0001 C CNN
	1    6200 2050
	1    0    0    -1  
$EndComp
Wire Wire Line
	5800 2050 5750 2050
Wire Wire Line
	5750 2050 5750 2150
Wire Wire Line
	5750 2150 5800 2150
$Comp
L Device:R R2
U 1 1 5CB94CFF
P 4250 1950
F 0 "R2" V 4043 1950 50  0000 C CNN
F 1 "1k" V 4134 1950 50  0000 C CNN
F 2 "" V 4180 1950 50  0001 C CNN
F 3 "~" H 4250 1950 50  0001 C CNN
	1    4250 1950
	0    1    1    0   
$EndComp
$Comp
L Device:D_Zener ZD1
U 1 1 5CB95601
P 4000 1550
F 0 "ZD1" V 4046 1471 50  0000 R CNN
F 1 "3.3V" V 3955 1471 50  0000 R CNN
F 2 "" H 4000 1550 50  0001 C CNN
F 3 "~" H 4000 1550 50  0001 C CNN
	1    4000 1550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	5800 1950 5500 1950
Wire Wire Line
	4100 1950 4000 1950
Wire Wire Line
	4000 1700 4000 1950
Connection ~ 4000 1950
$Comp
L Device:R R4
U 1 1 5CB9841F
P 5500 1450
F 0 "R4" H 5570 1496 50  0000 L CNN
F 1 "10k" H 5570 1405 50  0000 L CNN
F 2 "" V 5430 1450 50  0001 C CNN
F 3 "~" H 5500 1450 50  0001 C CNN
	1    5500 1450
	1    0    0    -1  
$EndComp
Wire Wire Line
	5500 1600 5500 1950
Connection ~ 5500 1950
Wire Wire Line
	5500 1950 4400 1950
$Comp
L power:+5V #PWR012
U 1 1 5CB98ED3
P 5500 1100
F 0 "#PWR012" H 5500 950 50  0001 C CNN
F 1 "+5V" H 5515 1273 50  0000 C CNN
F 2 "" H 5500 1100 50  0001 C CNN
F 3 "" H 5500 1100 50  0001 C CNN
	1    5500 1100
	1    0    0    -1  
$EndComp
Wire Wire Line
	5500 1100 5500 1300
$Comp
L power:GND #PWR06
U 1 1 5CB996CA
P 2600 1750
F 0 "#PWR06" H 2600 1500 50  0001 C CNN
F 1 "GND" V 2605 1622 50  0000 R CNN
F 2 "" H 2600 1750 50  0001 C CNN
F 3 "" H 2600 1750 50  0001 C CNN
	1    2600 1750
	0    -1   -1   0   
$EndComp
$Comp
L power:+5V #PWR07
U 1 1 5CB99CD2
P 2600 1850
F 0 "#PWR07" H 2600 1700 50  0001 C CNN
F 1 "+5V" V 2615 1978 50  0000 L CNN
F 2 "" H 2600 1850 50  0001 C CNN
F 3 "" H 2600 1850 50  0001 C CNN
	1    2600 1850
	0    1    1    0   
$EndComp
Wire Wire Line
	1800 1750 2600 1750
Wire Wire Line
	1800 1850 2600 1850
Wire Wire Line
	3050 2050 3050 2250
Connection ~ 5750 2150
Text Label 1950 1750 0    50   ~ 0
GND
Text Label 1950 1850 0    50   ~ 0
+5V
Text Label 1950 1950 0    50   ~ 0
RXD
Text Label 1950 2050 0    50   ~ 0
TXD
$Comp
L power:+5V #PWR013
U 1 1 5CBA0963
P 6200 1100
F 0 "#PWR013" H 6200 950 50  0001 C CNN
F 1 "+5V" H 6215 1273 50  0000 C CNN
F 2 "" H 6200 1100 50  0001 C CNN
F 3 "" H 6200 1100 50  0001 C CNN
	1    6200 1100
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR014
U 1 1 5CBA0E2E
P 6200 2750
F 0 "#PWR014" H 6200 2500 50  0001 C CNN
F 1 "GND" H 6205 2577 50  0000 C CNN
F 2 "" H 6200 2750 50  0001 C CNN
F 3 "" H 6200 2750 50  0001 C CNN
	1    6200 2750
	1    0    0    -1  
$EndComp
Wire Wire Line
	6200 2650 6200 2750
$Comp
L power:GND #PWR010
U 1 1 5CBA1C43
P 4000 1100
F 0 "#PWR010" H 4000 850 50  0001 C CNN
F 1 "GND" H 4005 927 50  0000 C CNN
F 2 "" H 4000 1100 50  0001 C CNN
F 3 "" H 4000 1100 50  0001 C CNN
	1    4000 1100
	-1   0    0    1   
$EndComp
Wire Wire Line
	4000 1100 4000 1400
$Comp
L Device:C C4
U 1 1 5CBA292A
P 6500 1300
F 0 "C4" V 6248 1300 50  0000 C CNN
F 1 "100n" V 6339 1300 50  0000 C CNN
F 2 "" H 6538 1150 50  0001 C CNN
F 3 "~" H 6500 1300 50  0001 C CNN
	1    6500 1300
	0    1    1    0   
$EndComp
Wire Wire Line
	6350 1300 6200 1300
Connection ~ 6200 1300
Wire Wire Line
	6200 1300 6200 1550
$Comp
L power:GND #PWR015
U 1 1 5CBA38AE
P 6750 1300
F 0 "#PWR015" H 6750 1050 50  0001 C CNN
F 1 "GND" V 6755 1172 50  0000 R CNN
F 2 "" H 6750 1300 50  0001 C CNN
F 3 "" H 6750 1300 50  0001 C CNN
	1    6750 1300
	0    -1   -1   0   
$EndComp
Wire Wire Line
	6650 1300 6750 1300
$Comp
L Device:CP C5
U 1 1 5CBA4F13
P 7850 5050
F 0 "C5" H 7968 5096 50  0000 L CNN
F 1 "10µ/16V" H 7968 5005 50  0000 L CNN
F 2 "" H 7888 4900 50  0001 C CNN
F 3 "~" H 7850 5050 50  0001 C CNN
	1    7850 5050
	1    0    0    -1  
$EndComp
$Comp
L Connector:DB9_Female J2
U 1 1 5CBAC88B
P 10250 1850
F 0 "J2" H 10430 1896 50  0000 L CNN
F 1 "DB9_Female" H 10430 1805 50  0000 L CNN
F 2 "" H 10250 1850 50  0001 C CNN
F 3 " ~" H 10250 1850 50  0001 C CNN
	1    10250 1850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR024
U 1 1 5CBB4A1B
P 9850 2250
F 0 "#PWR024" H 9850 2000 50  0001 C CNN
F 1 "GND" V 9855 2122 50  0000 R CNN
F 2 "" H 9850 2250 50  0001 C CNN
F 3 "" H 9850 2250 50  0001 C CNN
	1    9850 2250
	0    1    1    0   
$EndComp
Wire Wire Line
	9850 2250 9950 2250
$Comp
L power:+5V #PWR023
U 1 1 5CBB59FE
P 9850 1550
F 0 "#PWR023" H 9850 1400 50  0001 C CNN
F 1 "+5V" V 9865 1678 50  0000 L CNN
F 2 "" H 9850 1550 50  0001 C CNN
F 3 "" H 9850 1550 50  0001 C CNN
	1    9850 1550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9850 1550 9950 1550
Wire Wire Line
	9350 1850 9350 2250
Wire Wire Line
	9350 1850 9950 1850
Wire Wire Line
	1800 2050 3050 2050
$Comp
L Timer:NE555P U1
U 1 1 5F208B43
P 2350 6050
F 0 "U1" H 2050 6450 50  0000 C CNN
F 1 "NE555" H 2600 6450 50  0000 C CNN
F 2 "Package_DIP:DIP-8_W7.62mm" H 3000 5650 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ne555.pdf" H 3200 5650 50  0001 C CNN
	1    2350 6050
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR04
U 1 1 5F20AD35
P 2350 5350
F 0 "#PWR04" H 2350 5200 50  0001 C CNN
F 1 "+5V" H 2365 5523 50  0000 C CNN
F 2 "" H 2350 5350 50  0001 C CNN
F 3 "" H 2350 5350 50  0001 C CNN
	1    2350 5350
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR05
U 1 1 5F20BFE3
P 2350 6650
F 0 "#PWR05" H 2350 6400 50  0001 C CNN
F 1 "GND" H 2355 6477 50  0000 C CNN
F 2 "" H 2350 6650 50  0001 C CNN
F 3 "" H 2350 6650 50  0001 C CNN
	1    2350 6650
	1    0    0    -1  
$EndComp
Wire Wire Line
	2350 5350 2350 5450
Wire Wire Line
	2350 6450 2350 6650
$Comp
L power:+5V #PWR03
U 1 1 5F20DD5F
P 1700 6250
F 0 "#PWR03" H 1700 6100 50  0001 C CNN
F 1 "+5V" H 1715 6423 50  0000 C CNN
F 2 "" H 1700 6250 50  0001 C CNN
F 3 "" H 1700 6250 50  0001 C CNN
	1    1700 6250
	0    -1   -1   0   
$EndComp
Wire Wire Line
	1700 6250 1850 6250
$Comp
L Device:C C3
U 1 1 5F20EFE0
P 3400 6450
F 0 "C3" H 3515 6496 50  0000 L CNN
F 1 "10n" H 3515 6405 50  0000 L CNN
F 2 "" H 3438 6300 50  0001 C CNN
F 3 "~" H 3400 6450 50  0001 C CNN
	1    3400 6450
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR09
U 1 1 5F20FA74
P 3400 6650
F 0 "#PWR09" H 3400 6400 50  0001 C CNN
F 1 "GND" H 3405 6477 50  0000 C CNN
F 2 "" H 3400 6650 50  0001 C CNN
F 3 "" H 3400 6650 50  0001 C CNN
	1    3400 6650
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 6600 3400 6650
Wire Wire Line
	2850 6050 3400 6050
Wire Wire Line
	3400 6050 3400 6250
Wire Wire Line
	2850 6250 3400 6250
Connection ~ 3400 6250
Wire Wire Line
	3400 6250 3400 6300
$Comp
L Device:D D1
U 1 1 5F212E6D
P 3700 6050
F 0 "D1" H 3700 5833 50  0000 C CNN
F 1 "1N4148" H 3700 5924 50  0000 C CNN
F 2 "" H 3700 6050 50  0001 C CNN
F 3 "~" H 3700 6050 50  0001 C CNN
	1    3700 6050
	-1   0    0    1   
$EndComp
Wire Wire Line
	3400 6050 3550 6050
Connection ~ 3400 6050
Wire Wire Line
	3850 6050 4050 6050
Wire Wire Line
	4050 6050 4050 6900
Wire Wire Line
	4050 6900 1200 6900
Wire Wire Line
	1200 6900 1200 5850
Wire Wire Line
	1200 5850 1850 5850
$Comp
L Device:C C2
U 1 1 5F216AEB
P 1650 6050
F 0 "C2" V 1398 6050 50  0000 C CNN
F 1 "100n" V 1489 6050 50  0000 C CNN
F 2 "" H 1688 5900 50  0001 C CNN
F 3 "~" H 1650 6050 50  0001 C CNN
	1    1650 6050
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR02
U 1 1 5F21A30C
P 1450 6050
F 0 "#PWR02" H 1450 5800 50  0001 C CNN
F 1 "GND" H 1455 5877 50  0000 C CNN
F 2 "" H 1450 6050 50  0001 C CNN
F 3 "" H 1450 6050 50  0001 C CNN
	1    1450 6050
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 6050 1500 6050
Wire Wire Line
	1800 6050 1850 6050
Connection ~ 5750 2250
Wire Wire Line
	5750 2250 5800 2250
Wire Wire Line
	5750 2250 5750 6050
$Comp
L power:+5V #PWR08
U 1 1 5F2D08C9
P 3400 5050
F 0 "#PWR08" H 3400 4900 50  0001 C CNN
F 1 "+5V" H 3415 5223 50  0000 C CNN
F 2 "" H 3400 5050 50  0001 C CNN
F 3 "" H 3400 5050 50  0001 C CNN
	1    3400 5050
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 5050 3400 5150
$Comp
L Device:C C1
U 1 1 5F2DD0AB
P 1650 5450
F 0 "C1" V 1398 5450 50  0000 C CNN
F 1 "100n" V 1489 5450 50  0000 C CNN
F 2 "" H 1688 5300 50  0001 C CNN
F 3 "~" H 1650 5450 50  0001 C CNN
	1    1650 5450
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR01
U 1 1 5F2DD6EA
P 1450 5450
F 0 "#PWR01" H 1450 5200 50  0001 C CNN
F 1 "GND" H 1455 5277 50  0000 C CNN
F 2 "" H 1450 5450 50  0001 C CNN
F 3 "" H 1450 5450 50  0001 C CNN
	1    1450 5450
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 5450 1500 5450
Wire Wire Line
	1800 5450 2350 5450
Connection ~ 2350 5450
Wire Wire Line
	2350 5450 2350 5650
NoConn ~ 9950 1450
NoConn ~ 9950 1650
NoConn ~ 9950 1750
NoConn ~ 9950 2050
NoConn ~ 9950 2150
Wire Wire Line
	7850 5200 7850 5700
$Comp
L Connector:Conn_01x05_Male J1
U 1 1 5F35710C
P 1600 1950
F 0 "J1" H 1708 2331 50  0000 C CNN
F 1 "serial" H 1708 2240 50  0000 C CNN
F 2 "" H 1600 1950 50  0001 C CNN
F 3 "~" H 1600 1950 50  0001 C CNN
	1    1600 1950
	1    0    0    -1  
$EndComp
$Comp
L Jumper:Jumper_3_Bridged12 JP1
U 1 1 5F35E621
P 2950 4200
F 0 "JP1" V 3100 4300 50  0000 L CNN
F 1 "TXDen" V 3000 4250 50  0000 L CNN
F 2 "" H 2950 4200 50  0001 C CNN
F 3 "~" H 2950 4200 50  0001 C CNN
	1    2950 4200
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2950 2150 1800 2150
Wire Wire Line
	4800 2150 5750 2150
Wire Wire Line
	2950 4450 2950 5850
Wire Wire Line
	2950 5850 2850 5850
Text Label 1950 2150 0    50   ~ 0
TXDen
$Comp
L Device:D D3
U 1 1 5F3DFD1F
P 4800 4800
F 0 "D3" V 4754 4880 50  0000 L CNN
F 1 "1N4148" V 4845 4880 50  0000 L CNN
F 2 "" H 4800 4800 50  0001 C CNN
F 3 "~" H 4800 4800 50  0001 C CNN
	1    4800 4800
	0    1    1    0   
$EndComp
$Comp
L Device:D D2
U 1 1 5F3F8197
P 4400 4200
F 0 "D2" H 4400 3983 50  0000 C CNN
F 1 "1N4148" H 4400 4074 50  0000 C CNN
F 2 "" H 4400 4200 50  0001 C CNN
F 3 "~" H 4400 4200 50  0001 C CNN
	1    4400 4200
	-1   0    0    1   
$EndComp
$Comp
L Device:Jumper_NC_Small JP2
U 1 1 5F3FFF29
P 4800 4450
F 0 "JP2" V 4846 4403 50  0000 R CNN
F 1 "TXDenF" V 4755 4403 50  0000 R CNN
F 2 "" H 4800 4450 50  0001 C CNN
F 3 "~" H 4800 4450 50  0001 C CNN
	1    4800 4450
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2950 2150 2950 3950
$Comp
L Device:R_POT RV1
U 1 1 5F42B185
P 3400 5300
F 0 "RV1" H 3330 5346 50  0000 R CNN
F 1 "50k" H 3330 5255 50  0000 R CNN
F 2 "" H 3400 5300 50  0001 C CNN
F 3 "~" H 3400 5300 50  0001 C CNN
	1    3400 5300
	1    0    0    -1  
$EndComp
Wire Wire Line
	3550 5300 3550 5150
Wire Wire Line
	3550 5150 3400 5150
Connection ~ 3400 5150
$Comp
L Device:R R3
U 1 1 5F439704
P 5150 4200
F 0 "R3" V 4943 4200 50  0000 C CNN
F 1 "10k" V 5034 4200 50  0000 C CNN
F 2 "" V 5080 4200 50  0001 C CNN
F 3 "~" H 5150 4200 50  0001 C CNN
	1    5150 4200
	0    1    1    0   
$EndComp
$Comp
L 74xx:74HC04 U2
U 1 1 5F456267
P 5150 6050
F 0 "U2" H 5150 5733 50  0000 C CNN
F 1 "74HC04" H 5150 5824 50  0000 C CNN
F 2 "" H 5150 6050 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 5150 6050 50  0001 C CNN
	1    5150 6050
	-1   0    0    1   
$EndComp
$Comp
L 74xx:74HC04 U2
U 2 1 5F23E82B
P 4450 6050
F 0 "U2" H 4450 5733 50  0000 C CNN
F 1 "74HC04" H 4450 5824 50  0000 C CNN
F 2 "" H 4450 6050 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 4450 6050 50  0001 C CNN
	2    4450 6050
	-1   0    0    1   
$EndComp
Wire Wire Line
	4850 6050 4800 6050
Wire Wire Line
	4150 6050 4050 6050
Connection ~ 4050 6050
Wire Wire Line
	5450 6050 5750 6050
Wire Wire Line
	4800 4950 4800 6050
Connection ~ 4800 6050
Wire Wire Line
	4800 6050 4750 6050
Wire Wire Line
	4800 4650 4800 4550
Wire Wire Line
	4250 4200 3100 4200
Wire Wire Line
	4550 4200 4800 4200
Wire Wire Line
	4800 4350 4800 4200
Connection ~ 4800 4200
Wire Wire Line
	5000 4200 4800 4200
$Comp
L power:GND #PWR011
U 1 1 5F27D977
P 5350 4200
F 0 "#PWR011" H 5350 3950 50  0001 C CNN
F 1 "GND" H 5355 4027 50  0000 C CNN
F 2 "" H 5350 4200 50  0001 C CNN
F 3 "" H 5350 4200 50  0001 C CNN
	1    5350 4200
	0    -1   -1   0   
$EndComp
Wire Wire Line
	5300 4200 5350 4200
$Comp
L 74xx:74HC04 U2
U 4 1 5F29FB37
P 4800 3000
F 0 "U2" H 4800 2683 50  0000 C CNN
F 1 "74HC04" H 4800 2774 50  0000 C CNN
F 2 "" H 4800 3000 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 4800 3000 50  0001 C CNN
	4    4800 3000
	0    -1   -1   0   
$EndComp
$Comp
L 74xx:74HC04 U2
U 3 1 5F2A43AE
P 4800 3650
F 0 "U2" H 4800 3333 50  0000 C CNN
F 1 "74HC04" H 4800 3424 50  0000 C CNN
F 2 "" H 4800 3650 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 4800 3650 50  0001 C CNN
	3    4800 3650
	0    -1   -1   0   
$EndComp
Wire Wire Line
	4800 3300 4800 3350
Wire Wire Line
	4800 3950 4800 4200
Wire Wire Line
	4800 2700 4800 2150
$Comp
L 74xx:74HC04 U2
U 7 1 5F35960F
P 8700 5100
F 0 "U2" H 8500 5450 50  0000 C CNN
F 1 "74HC04" H 8700 5100 50  0000 C CNN
F 2 "" H 8700 5100 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/74HC_HCT04.pdf" H 8700 5100 50  0001 C CNN
	7    8700 5100
	1    0    0    -1  
$EndComp
$Comp
L power:+5V #PWR019
U 1 1 5F368B46
P 8700 4350
F 0 "#PWR019" H 8700 4200 50  0001 C CNN
F 1 "+5V" H 8715 4523 50  0000 C CNN
F 2 "" H 8700 4350 50  0001 C CNN
F 3 "" H 8700 4350 50  0001 C CNN
	1    8700 4350
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR020
U 1 1 5F369165
P 8700 5700
F 0 "#PWR020" H 8700 5450 50  0001 C CNN
F 1 "GND" H 8705 5527 50  0000 C CNN
F 2 "" H 8700 5700 50  0001 C CNN
F 3 "" H 8700 5700 50  0001 C CNN
	1    8700 5700
	1    0    0    -1  
$EndComp
Wire Wire Line
	8700 5600 8700 5700
$Comp
L Device:C C6
U 1 1 5F36E655
P 8950 4500
F 0 "C6" V 8698 4500 50  0000 C CNN
F 1 "100n" V 8789 4500 50  0000 C CNN
F 2 "" H 8988 4350 50  0001 C CNN
F 3 "~" H 8950 4500 50  0001 C CNN
	1    8950 4500
	0    1    1    0   
$EndComp
Wire Wire Line
	8700 4600 8700 4500
Wire Wire Line
	8800 4500 8700 4500
Connection ~ 8700 4500
Wire Wire Line
	8700 4500 8700 4350
$Comp
L power:GND #PWR022
U 1 1 5F37E4C5
P 9150 4500
F 0 "#PWR022" H 9150 4250 50  0001 C CNN
F 1 "GND" H 9155 4327 50  0000 C CNN
F 2 "" H 9150 4500 50  0001 C CNN
F 3 "" H 9150 4500 50  0001 C CNN
	1    9150 4500
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9100 4500 9150 4500
Wire Wire Line
	6200 1100 6200 1300
$Comp
L power:+5V #PWR017
U 1 1 5F3F5136
P 7850 4350
F 0 "#PWR017" H 7850 4200 50  0001 C CNN
F 1 "+5V" H 7865 4523 50  0000 C CNN
F 2 "" H 7850 4350 50  0001 C CNN
F 3 "" H 7850 4350 50  0001 C CNN
	1    7850 4350
	1    0    0    -1  
$EndComp
Wire Wire Line
	7850 4350 7850 4900
$Comp
L power:GND #PWR018
U 1 1 5F403F05
P 7850 5700
F 0 "#PWR018" H 7850 5450 50  0001 C CNN
F 1 "GND" H 7855 5527 50  0000 C CNN
F 2 "" H 7850 5700 50  0001 C CNN
F 3 "" H 7850 5700 50  0001 C CNN
	1    7850 5700
	1    0    0    -1  
$EndComp
Text Notes 10100 1150 0    50   ~ 0
RS485
Text Notes 1350 1150 0    50   ~ 0
Serial (LV)TTL\n5V power supply\n3.3V signals (RxD, TxD, TxDen)
Text Notes 3100 4100 0    50   ~ 0
2-3: TxDen from\nexternal pin
Text Notes 3100 4500 0    50   ~ 0
1-2: TxDen from\ninternal timer
Text Notes 3600 5400 0    50   ~ 0
TxDen\ntimeout
Text Notes 4400 4600 0    50   ~ 0
closed:\nTxDen\nfast start
Wire Wire Line
	3050 2250 5750 2250
Wire Wire Line
	1800 1950 4000 1950
$Comp
L Device:R R1
U 1 1 5F4C631B
P 3400 5650
F 0 "R1" H 3470 5696 50  0000 L CNN
F 1 "220" H 3470 5605 50  0000 L CNN
F 2 "" V 3330 5650 50  0001 C CNN
F 3 "~" H 3400 5650 50  0001 C CNN
	1    3400 5650
	1    0    0    -1  
$EndComp
Wire Wire Line
	3400 5450 3400 5500
Wire Wire Line
	3400 5800 3400 6050
$Comp
L Device:R R5
U 1 1 5F2557D9
P 7800 1200
F 0 "R5" V 7593 1200 50  0000 C CNN
F 1 "390" V 7684 1200 50  0000 C CNN
F 2 "" V 7730 1200 50  0001 C CNN
F 3 "~" H 7800 1200 50  0001 C CNN
	1    7800 1200
	0    1    1    0   
$EndComp
$Comp
L Device:R R6
U 1 1 5F255B99
P 8200 1200
F 0 "R6" V 7993 1200 50  0000 C CNN
F 1 "220" V 8084 1200 50  0000 C CNN
F 2 "" V 8130 1200 50  0001 C CNN
F 3 "~" H 8200 1200 50  0001 C CNN
	1    8200 1200
	0    1    1    0   
$EndComp
$Comp
L Device:R R7
U 1 1 5F2561C4
P 8600 1200
F 0 "R7" V 8393 1200 50  0000 C CNN
F 1 "390" V 8484 1200 50  0000 C CNN
F 2 "" V 8530 1200 50  0001 C CNN
F 3 "~" H 8600 1200 50  0001 C CNN
	1    8600 1200
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR021
U 1 1 5F256A12
P 8850 1200
F 0 "#PWR021" H 8850 950 50  0001 C CNN
F 1 "GND" V 8855 1072 50  0000 R CNN
F 2 "" H 8850 1200 50  0001 C CNN
F 3 "" H 8850 1200 50  0001 C CNN
	1    8850 1200
	0    -1   -1   0   
$EndComp
$Comp
L power:+5V #PWR016
U 1 1 5F257E11
P 7550 1200
F 0 "#PWR016" H 7550 1050 50  0001 C CNN
F 1 "+5V" H 7565 1373 50  0000 C CNN
F 2 "" H 7550 1200 50  0001 C CNN
F 3 "" H 7550 1200 50  0001 C CNN
	1    7550 1200
	0    -1   -1   0   
$EndComp
$Comp
L Switch:SW_DPST SW1
U 1 1 5F26E5D5
P 8200 1550
F 0 "SW1" V 8246 1362 50  0000 R CNN
F 1 "term_en" V 8155 1362 50  0000 R CNN
F 2 "" H 8200 1550 50  0001 C CNN
F 3 "~" H 8200 1550 50  0001 C CNN
	1    8200 1550
	0    -1   -1   0   
$EndComp
Text Label 9400 1950 0    39   ~ 0
NEG(PB-A)
Text Label 9400 1850 0    39   ~ 0
POS(PB-B)
Wire Wire Line
	7550 1200 7650 1200
Wire Wire Line
	7950 1200 8000 1200
Wire Wire Line
	8350 1200 8400 1200
Wire Wire Line
	8750 1200 8850 1200
Wire Wire Line
	8100 1350 8000 1350
Wire Wire Line
	8000 1350 8000 1200
Connection ~ 8000 1200
Wire Wire Line
	8000 1200 8050 1200
Wire Wire Line
	8300 1350 8400 1350
Wire Wire Line
	8400 1350 8400 1200
Connection ~ 8400 1200
Wire Wire Line
	8400 1200 8450 1200
Wire Wire Line
	6600 2250 8100 2250
Wire Wire Line
	6600 1950 8300 1950
Wire Wire Line
	8300 1750 8300 1950
Connection ~ 8300 1950
Wire Wire Line
	8100 1750 8100 2250
Connection ~ 8100 2250
Text Label 6650 2250 0    39   ~ 0
POS(PB-B)
Text Label 6650 1950 0    39   ~ 0
NEG(PB-A)
Wire Wire Line
	8300 1950 9950 1950
Wire Wire Line
	8100 2250 9350 2250
Wire Notes Line
	9250 700  9250 2500
Wire Notes Line
	9250 2500 7200 2500
Wire Notes Line
	7200 2500 7200 700 
Wire Notes Line
	7200 700  9250 700 
Text Notes 7250 800  0    50   ~ 0
Optional Profibus termination
Wire Notes Line
	850  4250 6150 4250
Wire Notes Line
	6150 4250 6150 7300
Wire Notes Line
	6150 7300 850  7300
Wire Notes Line
	850  7300 850  4250
Text Notes 5350 7250 0    50   ~ 0
internal TxDen timer
$EndSCHEMATC