# Hardware

URL: https://irs.systems/en/docs/level-converter/hardware

## Specifications

| Parameter | Value |
| --- | --- |
| Supply Voltage | 6V to 24V |
| RS232 IOs | see SN65C3222 |
| K-Line IOs | 2V to 30V; 0.5A to GND |
| RS485 IOs | see SN65HVD1792D |
| Isolation | see Si8420BB and MEE1S0505SC |
| K-Line Baudrate | 200 KBaud specified by IRS but tested with up to 1.5 MBaud. See oscilloscope screenshots with 256 KBaud, 500 KBaud and 1 MBaud. |
| RS485 Baudrate | 1 MBaud specified by the RS485 Transceiver but tested with up to 3 MBaud. See oscilloscope screenshots with 1 MBaud, 2 MBaud and 3 MBaud. |

## Absolute maximum ratings

| Parameter | Value |
| --- | --- |
| Supply Voltage | -0.3V to 25V |
| RS232 IOs | see SN65C3222 |
| K-Line IOs | -0.3V to 36V (see LM2903D) |
| RS485 IOs | see SN65HVD1792D |
| Isolation | see SI8663BB and MEE1S0505SC |

Exceeding the limits might damage the device.

## Connectors

### Terminal block

| Pin | Function | Alternative | Direction | Comment |
| --- | --- | --- | --- | --- |
| 1 | V<sub>Supply</sub> | | input | 6 to 24V |
| 2 | GND<sub>PC</sub> | | | |

### D-Sub9 RS232 (female)

| Pin | Function | Alternative | Direction | Comment |
| --- | --- | --- | --- | --- |
| 1 | | | | |
| 2 | Rx | | output | Connect with Rx from PC. |
| 3 | Tx | | input | Connect with Tx from PC. |
| 4 | | V<sub>Supply</sub> (jumper) | input | 6 to 24V. Alternative for Supply Voltage if the terminal block is not used. A custom cable is needed. |
| 5 | GND<sub>PC</sub> | | | Connect with GND from PC. |
| 6 | DSR | | output | |
| 7 | RTS | V<sub>Supply</sub> (jumper) | input | 6 to 24V. Connect with RTS from PC. Alternative for Supply Voltage if the terminal block is not used. A custom cable is needed. |
| 8 | CTS | | output | Connect with CTS from PC. |
| 9 | | GND<sub>PC</sub> (jumper) | | |

### D-Sub9 K-Line / RS485 (male)

| Pin | K-Line | Direction | RS485 | Direction |
| --- | --- | --- | --- | --- |
| 1 | V<sub>Bat</sub> | input | Tx<sub>p</sub> | output |
| 2 | L | input | Rx<sub>p</sub> | input |
| 3 | K | input/output | RTS<sub>p</sub> | output |
| 4 | GND | | CTS<sub>p</sub> | input |
| 5 | GND | | GND | |
| 6 | V<sub>Bat</sub> | input | Tx<sub>n</sub> | output |
| 7 | GND | | Rx<sub>n</sub> | input |
| 8 | GND | | RTS<sub>n</sub> | output |
| 9 | GND | | CTS<sub>n</sub> | input |

## Jumper configuration

### General

It is possible to use a custom RS232 cable with wires for V<sub>Supply</sub> (Pin 4 and 7) and GND<sub>PC</sub> (Pin 9) to supply the PCB. To be able to use the Pins on the D-Sub9, the jumpers J1, J2 and J3 have to be set.

| Jumper | Name | Comment |
| --- | --- | --- |
| J1 | GND<sub>PC</sub> | Pin 9 on RS232 D-Sub9 |
| J2 | VS3 | Pin 4 on RS232 D-Sub9 |
| J3 | VS2 | Pin 7 on RS232 D-Sub9. This is for backward compatibility only. Please use J2 if possible. The RTS signal is on this pin and may be used for the RS485 variant. |

> **Warning**
> If the jumpers J2 and J3 are set and a standard RS232 cable is used, your RS232 interface card may get damaged. If you are dauntless, you can use the RS232 status lines to power the PCB. Just use a standard RS232 cable and set the jumpers J2 and J3. The PCB needs at least 20mA. But be warned, if the RS232 interface can’t deliver this current on the status lines it might get damaged.

### K-Line

| Jumper | Name | Comment |
| --- | --- | --- |
| J1 | UBatt / VCC | Configuration for the pull-up voltage at the communication line. UBAT: Pull-up voltage is UBAT from the DUT. VCC: Pull-up voltage is 5V from the interface. |
| J2 | Single / Double | Configuration for single wire communication (send and receive on K-Line) or double wire communication (send on K-Line and receive on L-Line) |

### RS485

| Jumper | Name | Comment |
| --- | --- | --- |
| J1 | | 180R terminating resistor from Tx<sub>P</sub> to Tx<sub>n</sub> |
| J2 | | 180R terminating resistor from Rx<sub>P</sub> to Rx<sub>n</sub> |
| J3 | | 180R terminating resistor from RTS<sub>P</sub> to RTS<sub>n</sub> |
| J4 | | 180R terminating resistor from CTS<sub>P</sub> to CTS<sub>n</sub> |
| J5 | | 10k resistor from RTS<sub>P</sub> to VCC |
| J6 | | 10k resistor from RTS<sub>n</sub> to GND |

## Order information

### PCB mounted on angle plate

- Overall dimensions: 267mm x 36mm x 18mm

| Variant | Order Number |
| --- | --- |
| Level Converter V5.0 **variant K-Line** | `118354` |
| Level Converter V5.0 **variant RS485** | `118355` |

### PCB in the box

- Dimensions of the box: 150mm x 80mm x 30mm
- Overall dimensions: 154mm x 80mm x 30mm

| Variant | Order Number |
| --- | --- |
| Level Converter V5.0 **variant K-Line** | `118229` |
| Level Converter V5.0 **variant RS485** | `118353` |