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Configuring Parallel Channels

Parallel Channel Configuration Information

Table 19 lists all configuration items, the purpose of each item, and the allowable value options for each item. The factory-set default values are underlined.

Table 19. Parallel Channel Attachment Items
Configuration Item Description Value Options
Parallel Link A Installed Specifies if Parallel Channel Link A is installed. Yes or No
Parallel Link B Installed Specifies if Parallel Channel Link B is installed. Yes or No
Device Address Specifies the 2-digit hexadecimal channel address which includes the device address.
Notes:
  1. In simplex mode, only one device address is required.

    In dual simplex mode, each printer requires a unique device address. Printer 1 requires an even number (for example, X'30'); Printer 2 requires the next consecutive number (for example, X'31').

  2. The duplex system does not require a unique number. It can use either of the addresses used for dual simplex Printer 1 or dual simplex Printer 2. However, it is often easier from an operational viewpoint to assign duplex a separate address (so the duplex and simplex printers look like unique devices to the operating system). The general convention in this case is to assign the duplex system the next consecutive address (even) after the address for simplex Printer 2.

    For example, if you define Printer 1 in dual simplex as X'30', you should then define Printer 2 in dual simplex as X'31', and, optionally, define the complete system in duplex as X'32'.

  3. The device addresses specified above must match the device addresses defined to the host PSF software, and in the case of S/390 hosts, the I/O device definitions.
00 to FF (Hexadecimal notation). Default is X'00'
Second Channel Specifies the switching mode of the Two-Channel Switch: Static or Dynamic Mode. When a second Parallel Channel is installed, a Two-Channel Switch facility is provided.
  • Static: You can enable only one channel at a time. You can connect two interfaces to two channels on the same processing unit, on tightly coupled processing units (units controlled by the same operating system), or on independent (uncoupled) processing units.
  • Dynamic: You can enable both channels at the same time with the two-Channel Switch used as a dynamic interface switch. Connect the two interfaces to two channels either on the same processing unit or on tightly-coupled processing units (units controlled by the same operating system).

You cannot select this item unless two channels are installed.

Static or Dynamic
Data Transfer Protocol Specifies the data transfer mode to be used: DC Interlocked or Data-Streaming.

If two channels are installed, both channels use the same protocol.

Interlocked or Data Streaming
Data Streaming Rate Specifies the data rate being used if you select the Data-Streaming Data Transfer Protocol. Use the highest rate that is supported by your system.

If two channels are installed, both channels use the same data rate.

  • 3.0MB/sec
  • 4.5MB/sec
Card 1 Slot Position The printer sets this entry automatically at power on time if the system senses the presence of a Parallel Channel card. This item is not selectable.
  • 2 or 4 or Not Installed (for Model ES1)
  • 6 or 8 or Not Installed (for Models ED1/ED2)
Card 2 Slot Position The printer sets this entry automatically at power on time if the system senses the presence of a Parallel Channel card. This item is not selectable.
  • 2 or 4 or Not Installed (for Model ES1)
  • 6 or 8 or Not Installed (for Models ED1/ED2)