ad Microscan MS-5000 Multidrop Concentrator polls and collects data over RS-485 multidrop network

MICROSCAN

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Microscan MS-5000 Multidrop Concentrator

Microscans series 5000 multidrop concentrator polls and collects data over an RS-485 multidrop network from up to 50 devices, including scanners, decoders, or bar-code label printers. Several concentrators can also be cascaded to poll more than 50 devices. The series 5000 makes it simple to integrate a network of Microscan bar-code scanning equipment with a host computer.

High-speed communication up to 38.4K baud over the multidrop network and with the host computer.

Direct, continual polling of the device network, using standard RS-485 multidrop protocols or polling mode D.

Simple integration with the host computer through easy-to-set, built-in software menus for RS-232C, RS-422, and RS-485 interfaces with standard and user-defined protocols.

Direct terminal hookup through auxiliary port for convenient access to configuration menus and current status of devices on the network.

General Specifications

Baud rate

Default 9600 baud for all three ports

Options
Host and LAN: 600, 1200, 2400, 4800, 9600, 19.2K, and 38.4K
Aux port options: 2400, 4800, 9600 and 19.2K
Number of bits transmitted per second
Note: due to timing considerations, polled modes require 2400 baud of faster.

Parity
Default: even
Options: even, odd, none
Error detection routine in which one data bit in each character is set to 1 or 0 so that the total number of 1 bits in the data field is even or odd.

Stop bits
Default: One
Options: One, two
Last one or two bits in each character to indicate the end of the character.

Data bits
Default: seven
Options: seven, eight
Number of bits in each character

RS-422
Default: RS232
Options: RS232, RS422
Used only in Point-to-point protocol, and not with RTS or CTS. RS422 is not used with Aux Port. When RS422 is disabled, RS232 is enabled. An exception to this is that whenever Multidrop or User Defined Multidrop is selected, the functioning standard is RS485 regardless of the displayed status of RS422 in the menus.

Aux mode
Default: enabled
Options: enabled, disabled
(Aux port only)
Used only when connected to the Aux Port (labeled "MONITOR" on the concentrator). Aux Mode can be used for menu configuration, device status monitoring, and for displaying host messages.

Turnaround timeout
Default: 15ms for Host Port and 12ms for LAN Port
Options: 1 to 250ms
The time that the concentrator will wait between its request for data and a device's response in a poll or select sequence.
At the Host port: the time the concentrator will wait for a response from the host when communicating with the host in Multidrop or User Defined Multidrop
At the LAN port: the time the concentrator will wait for a response from a LAN device when communicating with that device in Multidrop or User Defined Multidrop.
Note: turnaround timeout for the LAN Port in the host unit should be set for a longer period of time than it will take the concentrator to poll and receive the longest anticipated data string from the decoders it is polling.

Intercharacter timeout
Default: 15ms
Options: 1 to 250ms
Intercharacter Timeout (used only with Host Port) is the concentrator's waiting period between individual characters transmitted from the host.

Poll response timeout
Default: 15ms
Options: 1 to 250ms
(Host Port only)
Used only if the concentrator is in polled mode to its host. It is used to determine if too much time has lapsed since the poll came in from the host for it to safely answer the host's poll. It should be set to about 5 ms less than the turnaround timeout set in the host's LAN Port. This will ensure that if a response is made by the polled device, the host has not abandoned the device, and gone on to another device.
Note: Poll response timeout for the concentrator should be set to about 5ms less than the turnaround timeout set in the host's LAN setup. For example, if the longest data string coming from any decoder is 40 characters, set the host's LAN Port turnaround timeout to 50ms and Poll Response Timeout for the concentrator to 45ms.

Number of Devices
Default: 1
Options: 1 to 50
(LAN Port only)
Number of devices allows you to reduce the number of addresses polled by the concentrator from fifty to as a few as one (use the number of the last address you want polled). For example, if you know that the concentrator will have only six devices on the LAN, you can speed up polling by setting Number of Devices to six. Thus, the concentrator will not waste the time set for Turnaround Timeout by trying to poll nonexistence devices. The range is 1 to 50 devices.
Note: You cannot assign an address that exceeds the value used for Number of Devices.

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Specifications subject to change without notice.

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