Code Activated Switch (ICAS)


The RelComm, Inc. integrated Code Activated Switch (i-CAS) is a platform to provide service to multiple serial ports, typically under the control and direction of a single Master port, and four or more subordinate/Slave ports.

The i-CAS is an integrated logic solution for the replacement of the current CAS/4 assembly, and provides replacement for the obsolete UART components, with the additional requirement to replace all materials with lead-free RoHS compliant devices.

With the i-CAS, the communication link can also be made by any of the subordinate devices selecting the channel while the switch is in Switch Time (unlocked mode).

The i-CAS design is based on the CAS-ASIC component, an FPGA, which is used to provide most of the required logic.

New Key Features

In addition to the features carried over from the previous CAS, new features provided with the i-CAS includes:

  • On-board programmable PROM to provide function updates and maintenance via Active Serial and JTAG connections;
  • Integrated transceiver Loopback for faster fault isolation;
  • Watchdog” monitor for ASIC supervision;
  • Port Display provides the operator with several visual indications of Switch operations and status, including Power Good, Hex code port selection, port Lockout and communication error conditions;
  • Front panel indicators provide status of Data, Switch Time, Lockout, Control Handshake.
  • Power-on initialization includes Port Selection default and
  • Option for an internal modem

The standard user-selectable features remain: word length, baud rate, stop bits, DCE/DTE, Xon/Xoff mode, graphics mode, arming character, transparent mode, inactivity timeout, default power-up and lockout.

Full Specifications

Note: measurements are shown in both English & (Metric)


RS232/V.24, Full Duplex, Asynchronous and/or RS422/V.11, Full Duplex, Asynchronous

External Connectors

Female DB25 (Master Port and Subordinate Ports)

External Controls

MODE toggle switch; RESET push button switch

Internal Controls

Many functional parameters are switch selectable, including:

Baud/Data Rate: (2400, 4800, 9600, 19.2K, 38.4K, 57.6K, 76.8K, 115.2K Bps)

Word Format (7 or 8 Data bits; 1 or 2 Stop bits; Odd or Even Parity, enabled or disabled)

Port Configuration: DTE/DCE and Control Handshake configurable for each port

Auto Timeout: (0.5 minutes, 1.5 minutes, 7.3 minutes or disabled/infinite)

Arming Character: (switch selectable by the user)


LED’s for SWITCH TIME & LOCK-OUT; Bi-color LED’s for Master Port DATA and CONTROL status; 7- segment Port Display for PORT SELECTED, WatchDog and COMMUNICATION ERRORS

Internal Connectors

AS (Active Serial) and JTAG (Joint Test Action Group) for programming; AEX: ASIC signals access (future use); J6J8: 4-port expanders; P1: modem port; J9: modem power

Port Addressing

Code in the data stream assigns/selects the port.


115/230 VAC (switch-selectable; fuse as specified), 50/60Hz, 11 watts


15% to 95% Non-condensing


Operating: +32o F to 122o F (0oC to 50oC)

Storage: – 40o F to 158o F (-40oC to 70oC)


a) Aluminum, NEMA Standard 19 inch rack mount

b) Plastic, standalone (i-CAS/4 or /8 only)


Rack mount:

• i-CAS/4 or /8: 19” W x 10.75” D x 3.5” H; (48.26 cm W x 27.31 cm D x 8.89 cm H); 2-RETMA vertical rack space

• i-CAS/12 or /16: 19” W ) x 10.75” D x 5.25” H; (48.26 cm W x 27.31 cm D x 13.34 cm H); 3-RETMA vertical rack space

Standalone: 12.25” W x 11.75” D x 2.5” H; (31.115 cm W x 29.845 cm D x 6.35 cm H)


Rack mount: 5.5 pounds (2.5 kg)

Standalone: 4.0 pounds (1.8 kg)