The async support available for our products
falls into two categories: polled and character mode. The Polled support is a full implementation
of the vendor's Legacy protocol. The character mode is designed for connection of non-polled async
devices.
Polled Protocols
The supported polled async protocols are:
- NCR Poll/Select
- Tandem AM6520
- Unisys Poll/Select
- Visa
- 8A1
Character Mode
The async interface is designed to receive
non-blocked, character mode transmissions from the attached device. We can expand this interface
to support many different types device requirements, including Block Checks, enhanced flow control
and retry capabilities.
- Data Format - ASCII data format is
supported with 7 or 8 bit words
- Flow Control - RS-232C hardware,
XON/XOFF, ENQ/ACK and specialized device support.
Specialized
Terminal Protocols
The Gateways support many different types
of async terminals used in various industries. These Gateways implement the terminal protocol
in two ways:
- Host Emulation. With this mode,
the Gateway will emulate an async host and acquire the data for conversion and transfer to
another system.
- Intelligent Pass-through. With this
mode, the Gateway establishes a connection with a remote async connection and converts the
data from TCP/IP to async. The data can be sent from a Telnet or TCP/IP application. The
Gateway can accept a connection from the local async device or a remote TCP/IP Client. This
mode can be used for transfer of software updates to the terminal or for real-time control.
- XModem. With this mode, the
Gateway emulates a host for connection by a remote async system using XModem protocol.
XModem is used for simple file transfers between the two systems.
To view the available options that can be specified for this protocol,
please click here.
Async Card Comparisons
The Edge Gateways support async through a dedicated microprocessor
on each port. The Gateway 1000 (G1000) offers both intelligent and
non-intelligent cards for async interface. The data from the non-intelligent
cards is processed by the main G1000 processor instead of a dedicated
microprocessor at the port. The cards and protocols are:
| Card |
Ports |
Type |
BUS |
| G1000-4PC |
4 |
Non-intelligent |
ISA |
| G1000-4PC/P |
4 |
Non-intelligent |
PCI |
| G1000-8PC |
8 |
Non-intelligent |
ISA |
| G1000-8PC/P |
8 |
Non-intelligent |
PCI |
| G1000-Mod |
16 - 48 |
Non-intelligent |
n/a |
| G1000-MPC |
16 |
Non-intelligent |
ISA |
| G1000-MPC/P |
16 |
Non-intelligent |
PCI |
| G1000-PQuad |
4 |
Intelligent |
PCI |
| G1000-Quad |
4 |
Intelligent |
ISA |
| G1000-RAS-1 |
24 |
Non-intelligent |
PCI |
| G1000-RAS-2 |
48 |
Non-intelligent |
PCI |
| G1000-SPC |
1 |
Intelligent |
ISA |
The Intelligent cards support all of the async protocols available
from JBM Electronics. The Non-intelligent cards only the following
protocols:
- Character Mode
- NCR Poll/Select
- Visa
If you need further information on
async protocol or our implementation and support for this protocol,
please e-mail us.
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