SB2033 I/O Link has total 16 channels isolated wet contact or dry contact or open-collector input. Each input channel also can work as 32-bit counter input, the maximum frequency is 200Hz for total 16 channels and 1000Hz for only one channel. Output BUS is RS485 with has surge protection, to reduce interference by serial port communication, the output isolated by high speed opto-couplers. The modules are slave devices that can be easily connected to all Smartbox products.
SB2033 I/O Link

Features
Features | • Isolated digital inputs can be configured as counter input, total 32 bits,1000Hz • 32-bit counter be stored into FLASH when power off • Can measure frequency from 0 to 200Hz,the resolution is 0.1Hz • Accept reed and hall sensor output from water meter or other meters • Static and lightning protection for each input • The input channel number is configurable, can be set up from 1 channel through 16 channels, improve frequency for small count input |
Application | • Remote data acquisition • Process monitoring • Industrial process control • Energy management • Supervisory control • Security systems • Laboratory automation • Building automation • Product testing |
Technical Data
Input channel number | 16 |
Input range | +4V~+36V |
Input signal | wet contact, dry contact, open-collector |
Counter frequency | 100Hz@16channels;1000Hz@1channel |
Counter length | 32-bit |
Output BUS | RS485 with Standard Modbus protocol |
Output Protection | Lightning, static |
Power input | 9~24V(AC/DC) |
Power consumption | <0.6W |
Operation temperature | -20~85℃(-13~185℉) |
Storage temperature | -40~100℃(-40~212℉) |
Ambient humidity | 10%~90%RH |
Material, enclosure | Flame proof plastic |
Enclosure rating | IP31 |
Colour | Ice Blue |
Size | 100*69*25 mm |
Wiring diagram and description


1. Input wiring
Vcc1: Power source input for digital input 1 through 8
DI1 ~ DI8: Digital input channel 1 through 8
Vcc2: Power source input for digital input 9 through 16
DI9~DI16: Digital input channel 9 through 16
DGND: common for digital input 1 through 16, available in dry input mode
2. Power wiring
DC: 24V, positive end
GND, negative end
AC: 24V, hot line
GND, neutral line
3. Smartbox wiring
DATA+: connect to A end of RS485
DATA-: connect to B end of RS485
RGND: Connect to earth if necessary
4. Reset parameter to default
Put the jumper between GND and INIT ,the following parameters back to default.
Address of device: 254
Baudrate: 19200
Channel: enable all channels
Filtering: 200us for frequency input
5. LEDs indication
Heart: Flashing when the system is working
Comm: Flashing when serial port communication
Connecting Smartbox with SB2033 I/O Link
