Ren-T Assembly Instructions

Assembly

Case 1

Connecting PC to first controller without converting to RS485

1. Using a Center-Tap Transformer with the Center-Tap connected

• D1, D2, D3, R1, R2, P1, JR1, J1 (shunt), J2 (shunt)

2. Using a Transformer without a Center-Tap (or a disconnected Center-Tap)

• D1, D2, D3, D5, D6, R1, R2, P1, JR1, J1 (shunt), J2 (shunt)

Case 2

Connecting one Controller to the next (RS485 pass-through)

1. Using a Center-Tap Transformer with the Center-Tap connected

• D1, D2, D3, R1, R2, JR1, JR2 (omit shunts)

2. Using a Transformer without a Center-Tap (or a disconnected Center-Tap)

• D1, D2, D3, D5, D6, R1, R2, JR1, JR2 (omit shunts)

Case 3

Connecting PC to first controller, converting to RS485 in the process

1. Using a Center-Tap Transformer with the Center-Tap connected

• D1, D2, D3, D4, D7, R1, R2, P1, JR1, U1, U2, U3, C1, C2 (omit shunts)

2. Using a Transformer without a Center-Tap (or a disconnected Center-Tap)

• D1, D2, D3, D4, D5, D6, D7, R1, R2, P1, JR1, U1, U2, U3, C1, C2 (omit shunts)

BOM

Mouser part#'s listed.

• U3 ~ 1 - 595-UA78L05ACLPRE3 - Standard 5V, 100mA Fixed Pos Voltage Regulator

• U2 ~ 1 - 837-ISL81487EIP - RS-485/422 Interface ICs 5V TXRX ESD

• U3 ~ 1 - 595-SN75C189AN - RS-232 Interface ICs Quad Low Pwr

• C1 ~ 1 - 140-XRL16V10-RC - Radial Electrolytic Capacitors 16V 10uF 20%

• C2 ~ 1 - 140-XRL16V470-RC - Radial Electrolytic Capacitors 10V 470uF 20%

• D1, D2, D4, D5, D6, D7 ~ 6* - 625-1N5819-E3 - Schottky Rectifiers Vr/40V Io/1A ***(Different configs do not require 6 diodes!)***

• D3 ~ 1 - 604-WP7104GT ***(or)*** 604-WP7104IT - LED > GT = Green ~ IT = Red

• R1 ~ 1 - 291-1K-RC - 1/4W 5% Carbon Film Resistors 1Kohms 0.05

• R2 ~ 1 - 291-750-RC - 1/4W 5% Carbon Film Resistors 750ohms 0.05 (LED resistor)

• J1, J2 ~ 2 - 538-22-03-2021 - .100 K.K. Connectors VERT PCB HDR 2P TIN PLATING

• 2 - 649-65474-002LF - Bergcon Connectors SHUNT TIN

• P1 ~ 1 - 152-3409 - D-Sub Connectors 9C R/A PCB RECPT

• JR1, JR2 ~ 2 - 571-5520251-4 - Modular Jacks 8/8 SIDE ENTRY

Optional Parts

• 1 - 693-CMF1.1111.12 - Power Entry Modules 2.5A C8 INLET PCB MT (requires the AC cord below, or an older style 'laptop' power cord. Check the data sheet for a picture.)

• 1- 173-21114-E - AC Power Cord 10' 2W 18AWG BK

• 1 - 571-3902613 - IC Sockets 14P ECONOMY TIN

• 1 - 571-3902612 - IC Sockets 8P ECONOMY TIN

TRANFORMER CHOICES

41PG300 - 12.6CT .3A

838-3FS-412 - 12.6VAC 6.0VA Single Primary

838-3FD-412 - 12.6VAC 6.0VA Dual Primary (for 230V INPUT!)

• The transformers listed are not the only ones that can be used. They are what was used during the design and testing and are direct fits for the pads of the PCB.

Schematic