Code activated switch for RS485 (2-wire, half-duplex) or RS485/RS422 (4-wire, full-duplex) multi-drop networks, using non-addressable RS232 target/remote devices.
Network multiple RS232 devices over either RS485 (2-wire) or RS485/RS422 (4-wire), at distances up to 4000 ft. and data rates up to 115.2Kbps.
Software/hardware configuration of "Node address," Data rate, Parity, "Attention character," Unit address, time-out value, and operating modes.
Think of the CAS24 as an addressable interface converter that can communicate with RS232 devices using the same and/or different protocols/command structures.
GENERAL DESCRIPTION and TYPICAL APPLICATIONS:
The CAS24 "Code activated switch" allows RS232 devices that are normally non-addressable and only usable in point-to-point applications to be added to new or existing RS485 and/or RS422 networks. User programmable settings allow the CAS24 to be used as a versatile tool for constructing networks of almost any size (2-1000+ nodes).
The unit has jumpers for bias, termination, RS232 DTE/DCE selection, mode control, and "external/hardware" unit address (see manual and schematic).The unit has edge mounted LED indicators, a removable screw terminal connector, and SN75LBC184P limited slew rate transceivers (1/2 unit load) with built-in transient protection.
The CAS24 is designed for office and/or industrial applications (non-isolated), and provides superior characteristics/features normally found only on more expensive units. The CAS24 can also be used as a flexible interface converter. A host/remote network can be constructed using only 3 units (One converter and two addressable nodes).
Operating Manual (Good information for all CAS units)
|CAS24.exe||Setup Software for CAS24 Windows 95,98,NT|
Click on this image of the CAS24 for full-size photograph:
PHYSICAL PROPERTIES and FEATURES:
|RS232:||3-wire interface to RJ11/12 Connector (TX, RX, Common).|
|RS485:||Removable screw terminal (Common, TX/RX-, TX/RX+, RX-, RX+, Common).|
|Power:||2.1mm center positive "Barrel" connector (9VDC) and Wago terminals.|
|LEDs||Power(YEL), TX-RS485(RED), and RX-RS485(GRN), and RS232 enabled(GRN).|
|Bias:||620 Ohm pull-up and pull-down (jumper selectable).|
|Termination:||120 Ohm (jumper selectable)or 240 Ohm (jumper selectable).|
|Special:||Switching regulator, Windows software for setup.|
|Protection:||Up to 400W typical per SN75LBC184P specification.|
|Distance:||RS485 up to 4000 ft. (1250 meters)|
|Operation:||2-wire half-duplex RS485or 4-wire RS485/RS422|
|Format:||Asynchronous 8-data bits, parity optional|
|Speed:||2400, 4800, 9600, 14.4K, 19.2K, 28.8K, 38.4K, 57.6K, 115.2Kbps|
|Temperarure:||0-65C (32-150F) ambient.|
|Power:||Under 3/4 Watt(typical) + external load.|
|Size:||3.50" X 3.00" X 0.9" (PC Board), with connectors: 3.50" X 3.25"|
|Mounting:||4-Holes 3.00" X 2.25" (built-in standoffs for #6 hardware)|
OPTIONS AND ORDERING INFORMATION: (Model CAS24)
|CAS24:||$100.00 ea. (Circuit board only)|
|Enclosure:||$10.00 ea. (Medium)|
|Cable:||$7.50 ea. (RS232, 7 ft., Specify DB9F-7 or DB25F-7)|
|Supply:||$8.50 ea. (12VDC @ 200/300 mA wall power supply)|
|* CAS24 with all options (DB9F cable/Enclosure/PS): CAS24-B9FSPS @ $126.00 ea. (Qty. 1-9)|
Please call us at: 513-874-4796
R.E. Smith 10330 Chester Rd., Cincinnati, Ohio 45215