Serial I/O Modules
About Serial I/O Modules
SNAP serial communication modules are designed for use with the SNAP PAC System and can also be used in I/O units without a controller. Using the SNAP serial communication module as a converter, non-Ethernet devices can be connected to an Ethernet network and be available for control, monitoring, or data acquisition by any authorized PC or other device on the Ethernet network. All SNAP serial communication modules snap into Opto 22 SNAP PAC mounting racks right beside SNAP I/O® digital and analog modules, to provide the mix of analog, digital, and serial channels you need at any location.
View all Serial I/O Modules
SNAP-SCM-232
The SNAP-SCM-232 provides two RS-232 serial communication ports for two channels of high-speed, isolated serial data. Used with a brain or R-series controller, the module connects serial devices such as printers, scales, chart recorders, and barcode systems to an Ethernet network for control, monitoring, or data acquisition.
SNAP 2-Ch RS-232 Serial Communication Module
SNAP-SCM-232
| Baud Rates | 300–115,200* |
| Channel-to-channel isolation | 750 VRMS |
| Logic Supply Voltage | 5.0 VDC |
| Logic Supply Current | 250 mA DC |
| Number of ports per module | 2 (1 if SNAP-SCM-485-422 in 4-wire mode) |
| Max. number of modules per rack** | 5 |
| Maximum cable length, point-to-point (SNAP-SCM-232) | 50 feet |
| Maximum cable length, multidrop (SNAP-SCM-485-422) | 1,000 feet at 115,200 Kbd |
| Processor Compatibility | SNAP PAC R-series controllers and SNAP PAC EB brains, both standard wired and Wired+Wireless models. Also SNAP-B3000-ENET, SNAP-ENET-RTC, SNAP-ENET-S64, SNAP-UP1-ADS, and SNAP-UP1-M64. |
| Operating Temperature | -20 to 70 °C |
| Storage Temperature | -30 to 85 °C |
| Torque, hold-down screws | Not to exceed 1 in-lb (0.11 N-m) |
| Torque, connector screws | 5.22 in-lb (0.59 N-m) |
| Agency Approvals | UL, CE, RoHS, DFARS; UKCA NEBS (SNAP-SCM-232 only) ATEX (SNAP-SCM-485-422 only) |
| Warranty | 30 months |
| * Module performance is limited by the number of serial modules on the SNAP rack. Each rack backplane provides approximately 2.5 Mbps of bandwidth. ** Maximum number of modules per rack assumes a 4A power supply (i.e. SNAP-PS5). | |
SNAP-SCM-485-422
The SNAP-SCM-485-422 provides two 2-wire RS-485 serial communication ports for two channels of high-speed, isolated serial data, or one 4-wire serial communication port for a single channel. Used with a brain or R-series controller, the module connects serial devices such as printers, scales, chart recorders, and barcode systems to an Ethernet network for control, monitoring, or data acquisition.
SNAP 2-Ch RS-485/422 (2-wire or 4-wire) Serial Communication Module
SNAP-SCM-485-232
| Baud Rates | 300–115,200* |
| Channel-to-channel isolation | 750 VRMS |
| Logic Supply Voltage | 5.0 VDC |
| Logic Supply Current | 250 mA DC |
| Number of ports per module | 2 (1 if SNAP-SCM-485-422 in 4-wire mode) |
| Max. number of modules per rack** | 5 |
| Maximum cable length, point-to-point (SNAP-SCM-232) | 50 feet |
| Maximum cable length, multidrop (SNAP-SCM-485-422) | 1,000 feet at 115,200 Kbd |
| Processor Compatibility | SNAP PAC R-series controllers and SNAP PAC EB brains, both standard wired and Wired+Wireless models. Also SNAP-B3000-ENET, SNAP-ENET-RTC, SNAP-ENET-S64, SNAP-UP1-ADS, and SNAP-UP1-M64. |
| Operating Temperature | -20 to 70 °C |
| Storage Temperature | -30 to 85 °C |
| Torque, hold-down screws | Not to exceed 1 in-lb (0.11 N-m) |
| Torque, connector screws | 5.22 in-lb (0.59 N-m) |
| Agency Approvals | UL, CE, RoHS, DFARS; UKCA NEBS (SNAP-SCM-232 only) ATEX (SNAP-SCM-485-422 only) |
| Warranty | 30 months |
| * Module performance is limited by the number of serial modules on the SNAP rack. Each rack backplane provides approximately 2.5 Mbps of bandwidth. ** Maximum number of modules per rack assumes a 4A power supply (i.e. SNAP-PS5). | |
SNAP-SCM-ST2
The SNAP-SCM-ST2 pulse output module is a two-channel serial communication module that provides pulse and direction signals for stepper motor drives. Each channel is isolated from the logic side. The module can either output a constant frequency, or it can ramp from one frequency to another.
Pulse & Direction Digital Outputs X2
SNAP-SCM-ST2
| Frequency Range | 0.13–50,000 Hz |
| Pulse Width Range1 | 3.84 Sec to 10 µSec |
| Pulse Width Accuracy2 | 0–2 Hz, 2–30 Hz, 30–50,000 Hz (see graphs on the next page) |
| Output Format | CMOS/TTL Compatible |
| Logic Supply Voltage | 5.0 VDC |
| Logic Supply Current | 200 mA |
| Compatible I/O Processors | SNAP PAC R-series controllers and EB-series brains with R9.1a or newer firmware |
| Duty Cycle | Fixed at 50% |
| Number of Ports per Module | 2 |
| Operating Temperature Range | -20–60 °C |
| Storage Temperature Range | -30–85 °C |
| Torque, hold-down screws | Not to exceed 1 in-lb (0.11 N-m) |
| Torque, connector screws | 5.22 in-lb (0.59 N-m) |
| Agency Approvals | CE, RoHS, DFARS |
| Warranty | 30 months from date of manufacture |
| 1Pulse Width is equal to one-half the period. 2To find the frequency error in Hz: Frequency Error (+/-) = Desired Frequency - (1 ÷ (Pulse Width Resolution + (1 ÷ Desired Frequency))). | |
SNAP-SCM-CAN2B
The SNAP-SCM-CAN2B serial communication module provides one channel for transmitting and receiving data from devices on a Controller Area Network (CAN).
SNAP CAN (Controller Area Network) Communication Module
SNAP-SCM-CAN2B
| Baud Rates | 10–1000 Kbps* |
| Logic Supply Voltage | 5.0 VDC |
| Logic Supply Current | 250 mA DC |
| Number of ports per module | 1 |
| Max. number of modules per rack** | 8 |
| Processor Compatibility | SNAP PAC R-series controllers and SNAP PAC EB brains, both standard wired and Wired+Wireless models, with firmware 9.2a or newer. |
| Operating Temperature | -20 to 70 °C |
| Storage Temperature | -30 to 85 °C |
| Torque, hold-down screws | Not to exceed 1 in-lb (0.11 N-m) |
| Torque, connector screws | 5.22 in-lb (0.59 N-m) |
| Agency Approvals | UL, CE, RoHS, DFARS |
| Warranty | 30 months from date of manufacture |
| * Module performance is limited by the number of serial modules on the SNAP rack. Each rack backplane provides approximately 2.5 Mbps of bandwidth. ** Maximum number of modules per rack assumes a 4A power supply (i.e. SNAP-PS5). | |
