M3118 - CXA16/CXB16
The CXA16/CXB16 is a 16-line Asynchronous Serial Multiplexor using DEC-423/RS-423 outputs for the BA200 series enclosure. It can be used in applications including data concentration, real-time processing and interactive terminal handling. It has two programming modes: DHV11 and DHU11. In these two modes, the register sets are compatible with those of the DHV11 and DHU11 respectively. DHU11 is the preferred mode.
Main features
These are the main features of the CXA16/CXB16 as taken from the user manual (EK-CAB16-UG)
- Sixteen full-duplex asynchronous data-only channels
- The CXA16 supports DEC-423 connections, and the CXB16 supports DEC-422 connections (NOTE: DEC-422 is a term used here to indicate a data-leads-only implementation of the RS-422-A standard. DEC-423 is a term used here to indicate a data-leads-only implementation of the RS-423-A standard.)
- For each line: DMA transfers, and programmed transfers to a 1-character transmit buffer in DHV11 mode, or program transfers to a 64-character transmit FIFO in DHU11 mode
- A 256-entry FIFO buffer for received characters and diagnostic information
- For CXA16, the electrical characteristics and signalling standards are compatible with RS-423-A. As the physical interface does not use a 37-way D-subminitaure connector, it does not comply with this section of the RS-449 standards.
- For CXB16, the electrical characteristics and signalling standards are compatible with RS-422-A. As the physical interface does not use a 37-way D-subminature connector, it does not comply with this section of the RS-449 standards.
- Transmit and receive baud rates for each line can be individually programmed
- A total module throughput of 50,000 characters per second, using 8-bit characters, with all channels operating at 38.4kbaud for both character reception and transmission
- Automatic flow control of transmitted data, with XON/XOFF character reporting through the receive FIFO, if enabled.
- Self-test and background monitor testing
- Switch functions for selecting:
- Address and vectors
- DHV11 or DHU11 programming mode
- All other functions are selected by program
- The module handle forms part of the system bulkhead. Signal distribution is through two 36-way connectors.
- Transient surge suppressors on all serial lines for static discharge and surge protection
Documentation
- EK-CAB16-TM (manx) - No known copies online.
- EK-CAB16-UG (local) (manx)
Images
Three CXA16s, six H3104s and one BC16D-25 cable. One of the H3104 boxes looks like it had a bit more voltage than was good for it at some point. Click on the images for a larger version.
In Collection
| Qty: | Systems: | Module: | Option: |
| 3 | lhnvax | M3118-YA | CXA16-M |
| Qty: | Part: |
| 6 | H3104 |
| 6 | BC16D-25 |