OPT-SNAP-SCM-485-422

SNAP-SCM-485-422 SNAP 2-Ch RS-485/422 (2-wire or 4-wire) Serial Communication Module

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.
 
Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted
controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for
PC-based control or for use as intelligent remote I/O for an Allen-Bradley MicroLogix PLC or other RSLogix-based
system, such as ControlLogix or CompactLogix.
 
NOTE: The SNAP-SCM-485-422 is also compatible with SNAP Ethernet, SNAP Simple, and SNAP Ultimate brains.
 
For similar serial communication using RS-232, see 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**	8
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	0 to 70 °C
Storage temperature	-30 to 85 °C
Torque, hold-down screws	4 in-lb (0.45 N-m)
Torque, connector screws	5.26 in-lb (0.6 N-m)
Agency Approvals	CE, FM, RoHS, DFARS
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 an Opto 22 SNAP power sup­ply and SNAP rack.

Rev: 09/18