RS-232 to 3V/5V Logic Level Translator - User
Contents
1. 8 Pin 6 RTS out com DCE out Pin CTS in RI in RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs For a DCE example the target connects to the PC or USB to serial converter over RS232 like a modem or GPS receiver It requires jumpers on J2 jumper block for no handshake RTS CTS handshake used or handshake looped back See the below picture for how the jumpers are set o jz OO o o O e o oO lt oo x 00 0 x OC 10 a oo Q oola a e ol 5 O o gt fom n 2 O owl z Og o Q Male OO TKR Ko DES o o O Female ii iy RS232 Cable The serial line can be passively snooped by the target board for either the receive or transmit line DTE Data Terminal Equipment DCE Data Circuit Terminating Equipment Fig wo X1 doous J1q wo Xy doous Female RS232 Cable RS232 Cable RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs2. Some parts must be put in oriented correctly All parts except for J4 andJ5 are mounted on the top side that is the side with the white silk screen printing Wy Logic RS232 031712 RS232 DTE 40mm o Start with the two 10KQ resistors brown black orange gold Remove the resistors from the tape and bend Figure 2 Assembly Drawing the leads right angle to the body The resistors can be cut from the tape if you leave an inch or more of lead from the body Take a look at the how the resistor should look from Figure 3 Push the leads through the a holes marked R1 and R4 and while holding the resistor from the top side bend the leads out Figure 3 Resistor lead forming and installation slightly so the resistors don t fall out Figure 3 shows R1 placed on the board Solder the two leads of each resistor and then trim the leads once it s soldered as in Figure 4 In the same manner as the previous step install the 150Q resistors at R2 and R3 In the same manner as the previous step install the 1MQ resistors at R5 and R6 o Install the 0 1uF 50V capacitors C1 C2 C3 C4 and C5 These are not polarized and can be oriented either way They install like the resistors except do not require pre bending the leads See Figure 5 to see the resistors and Capacitors installed s 00000000 5 0o0000000 oO Figure 4 Trimming leads after soldering Figure 5 Capacitors and Resistors installe
3. glass Verify all parts are available before starting construction They should match this photograph although some of the parts may have variations in colors and markings Read through each of the assembly steps before doing the work Quantity Designator Rating Manufacturer Part Number Photo 1 5 C1 C2 0 1uF 50V X7R Murata RDER71H104KO0K1 C3 C4 C5 Ceramic Radial CO03B Capacitor gt a 2 2 D1 D2 Orange LED 2V Kingbright WP710A10SEC 20mA 3 1 J1 6 pin 2mm Molex 53014 0610 Optional Single Row Header 4 1 J2 16 pin 0 1 Dual FCI 68602 116HLF Row Header 5 1 J4 DE9 9 pin Male Amphenol L717SDE09P D Connector 6 1 J5 DE9 9 pin Amphenol L77SDE09S Female D se Connector oe RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs 53014 0410 4 pin 2mm Single Row Header a l B E 2N7000 NMOS Fairchild FET 60V Semiconductor 200mA TO 92 10K 5 1 8w Stackpole Axial Resistor 150 5 1 8w Stackpole CF18JT150R Axial Resistor 1M 5 1 8w Stackpole CF14JT1M00 Axial Resistor ADM3202 Analog ADM3202ANZ RS232 Level Devices Shifter DIP 16 2N7000_D26Z CF14JT10KO ii Printed Circuit Board e lt 3 y T y gt RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs Take a look at the Assembly drawing to the left Figure 2 Part placement is indicated by the reference designator like C1 R2 U1 J2 etc
4. CIRCUIT MONKEY RS232LS RS 232 to 3V 5V Logic Level Translator User Manual 5 19 2012 This printed circuit assembly will translate UART logic signals from 3V to 5 5V to EIA TIA 232 and V 28 V 24 specification Output transmit levels are 5V and receive levels can up to 20V Maximum data rate is 460kbps It requires 3V to 5 5V to operate at 3mA no load and 12mA with a maximum 3KQ load The board will translate both transmit and receive signals plus hardware handshake CTS RTS signals It can be a RS232 DTE data terminal equipment like a computer using a DE 9 pin male connector or a RS232 DCE Data circuit terminating equipment like a modem using a DE 9 pin female connector It can also snoop both transmit and receive as an inline device It has individual LEDs to monitor activity on the RS232 transmit and receive lines RS232 Driver Ul Cl a lt c vec 16 Dap 3 Voltage Doubler 2 N 0 1uF TR Cl V i GND 0 1uF 4 5 c ve E Daw 5 Voltage Inverter 0 1uF an 0 1uF c2 _RX 1 m2 2 oe LVCTS LYTXD 11 i
5. ation Solder the top and bottom pins and while apply Figure 8 Connectors installed pressure against the connector without touching the pins reflow RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs solder of the top and bottom pins to allow the part to seat properly on the PC board Solder the remaining pins The pins do not need to be trimmed o Install 16 pin dual row header at J2 This has 16 pins sticking through a plastic block one side has longer pins than the other side The side with the shorter length of pins goes into the board to be soldered Solder two diagonal pins insure the part is seated properly and then solder the remaining pads The pins do not need to be trimmed o Install the 9 pin D male connector at J4 left edge of the board The connector will mount on the edge of the PC Board The board will sandwich between the two rows of pins coming out of the back of the connector The connector has a five pins on top row and four pins on the bottom row The PC board has five exposed pads along the top edge of the board and four exposed pads on the bottom Orient the connector next to the PC board so that the five pads match up to the five pins on the connector With a gentle see saw movement slide the connector onto the PC board and insure the pins are in the center of the pads Heat one of the pads and flow solder making sure the connector is seated against the PC board and centered Solder the remaining sev
6. d RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs o Install the two FETs Q1 and Q2 These are 2N7000 NMOS FETs and must be oriented correctly with the board Notice the semicircle with a flat face on the PCB artwork This should match the half moon shape of the transistor The three leads go into the three pads make sure that the flat side of the half moon on the transistor matches the white printing on the PCB You can hold the transistor on one side and bend the outer two wire leads of the transistor to help hold it in The pads are close together so use just enough solder to Figure 6 Installing Transistors attach the wires and make sure the pads don t have solder bridge between them Trim the leads when soldered o Install the light emitting diodes LED at D1 and D2 These are polarized so pin orientation is important Hold the LED up and notice that one lead is longer than the other Now look at the white silk screen printing on the board for D1 and D2 There should be a round circle with two lines coming from the circle with one of the lines longer than the other Put the long lead into the hole where the longest line on the silkscreen as depicted in the figure to the right Once placed into the correct pads bend the leads as you did the Y B transistors and solder the connection Trim the leads with wire cutters when done H o Install the IC U1 which is 16 pin DIP package marked as Analog Devices ADM3202 on
7. d pin 6 goes to the ground return RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs Connecting RS232 to the RS232LS IBM defined RS232 end devices such as a computer as Data Terminal Equipment DTE and communication devices like the modem as a Data Circuit Terminating Equipment DCE Today this has come to mean DTE is the male DE9M on the PC or USB to Serial converter and DCE is what connects to the PC over RS232 and usually has a female DE9F The DCE could be a GPS motor controller etc RS232 connectors originally used DB25 25 pin D style on the early IBM PC The B in DB25 denoted the size of the connector The PC was later changed to the smaller DE9 connector although from a past mistake is often sold as DB9 DTE Data Terminal Equipment DCE Data Circuit Terminating Equipment Female RS232 Cable The DTE example is a microcontroller that wants to talk to an RS232 device that would normally plug into a PC male DE9 It requires jumpers on J2 jumper block for no handshake RTS CTS handshake used or handshake looped back See the below picture for how the jumpers are set DCE z Data Circuit Terminating T 7 z a 1 2 Semen Female oop Jool oo g 3 o0 5 es O A o o 8 a o o Q ool 00 x 6 RS232 Cable o o 2 ole oo
8. en pads on top and bottom of the PC board Figure 9 Installing the 9 pin D connector o Double check all connections and look for cold solder joints solder bridges bent pins badly seated parts This completes the assembly of the RS232 Level Translator Kit RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs Using the RS232 Translator Connecting logic UART to RS232LS The device you want to level shift will connect to either J1 6 pin if using CTS RTS handshaking or J6 4 pin if you aren t using handshaking The 6 pin connector mates with the Molex 51004 0600 housing with six Molex 50011 8000 contacts and 24 30AWG wire The 4 pin connector mates with the Molex 51004 0400 housing with six Molex 50011 8000 contacts and 24 30AWG wire These can be purchased with precrimped pigtails from Circuit Monkey You canalso not install the connectors on J1 or J6 and wire directly between the target and RS232LS For the 4 pin connector J6 pin 1 connects to the receive data input of the target Pin 2 connects to transmit data output from target Pin 3 goes to 3V to 5V power from I5 3V to 5v Power target max 12mA and pin 4 goes to the ground return 6 Ground For the 6 pin connector J1 pin 1 connects to CTS input of the target Pin2 connects to RTS output from the target Pin 3 goes to the receive data input of the target Pin 4 connects to transmit data output from target Pin 5 goes to 3V to 5V power from target max 12mA an
9. in gt Tlout 14 TX gt 3 Be 4S E G LVRTS LVRTS a ars ie 2 __LVRTS LVRTS 10 zin gt iou W RTs gt 5 O 6 7 x 3 LVRXD LVRXD 12 Riout lt Rin 13 Crs 7 Fe s 8 4 LVTXD LVCIS 9 Raout an E TX gt 9 gt 10 2 lt q a Pa 5 vcc 15 an RX4 11 o o 2 3 g i a op we ICL3232 crse 13 es 14 7 2 D oe MT aZ RIS gt 15 o 16 8 v GND 5 316 DIR GND J R1 4 10K g USR R2 R3 SL RI 1 LVRXD 150 150 R4 qm rx 10K o 2 LVTXD DTE Computer DCE Modem m TX a 3 vcc 4 5 3 3V 5V mii oe a sp ifya GND o 4 4 Ww 6 DSR 4 DCE 6 5 xT Di KI M a 2 RDA TXD 2 16 i 7 RTS gt cis 7 s WV e 3 TXD gt RDO 3 a GND he 8 CTS lt RTS 8 P t 2N7000 2N7000 e4 DR DE 4 7 z 9 RI lt RI 9 5 L e5 GND Sy d V R5 7 R6 z 1M 1M DE9 Male DE9 Female GND GND GND ND aD GND GND RS232 to 3V 5V Logic Level Translator Kit 2012 Ferndale Labs Figure 1 Schematic RS232 to 3V 5V Translator Building the kit This is a simple soldering project but assumes some soldering experience To find out more do a search on how to solder electronics using your favorite search engine A few sites such as aaroncake ElectronixExpress and Science Buddies have information on how to solder Equipment needed is a Soldering iron intended for electronic assembly b Solder can be leaded or lead free however do not use acid core solder c Wire cutters and needle nose pliers d Aclean well lit workspace e A magnifying
10. the top This part must be oriented correctly Look at the IC from the top there is a notch 5 at the top with a small circle to the left Now look at the PC board white marking there Da is a white dot and the U1 marking The dot on the IC and the dot on PC should be next to each other Sometimes the pins on DIP packages are skewed out and it s difficult getting all 16 pins into the holes I usually take the part between my fingers and put it with the side against a flat surface like a table to gently 2 3 gt 7 248 AA 3 7 bend the pins inwards Observing the correct orientation put the IC into the 16 pad holes and make sure that all the pins came through the pads Now solder two pads that are on diagonal from each other Pin 1 and pin 9 for example With your fingers pushing against the part reflow the solder on both pins so that the part is properly seated on the PC board Double check that the part is Figure 7 IC and LED installed oriented with pin 1 dot next to the PC silkscreen mark Now solder the remaining 14 pads You do not need to trim the leads on the IC At this stage the board should look like Figure 7 o Install the white 6 pin 2mm connector at J1 and the white 4 pin 2mm connector at J6 making sure they are properly oriented The connectors have 1 embossed on the side with the two open notches The 1 should be installed close to the dot and J1 J6 marking See Figure 8 for orient
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