SCS DATA STREAMS | Page |
SNA Printer Exception Conditions/Sense Codes
Exception conditions in SNA are reported by sending a negative response to the sender of the data. The negative response contains a sense code that describes the type of exception condition that occurred. Some of these conditions are errors, and some are just temporary exceptions.
The following is a list of SNA sense codes that can be sent to the host as the result of an exception condition involving a printer. Sense codes are made up of two bytes of information. The first byte describes the class of exception that occurred (10h for Request Errors, 08h for Request Reject). The second byte describes the specific condition.
Request Errors = 10h
05h = Parameter Error. This indicates an invalid SCS parameter in the data stream. This condition is usually the result of a programming error in the software that is building the SCS data stream. It may also be caused by sending an unsupported SCS command.
Request Reject = 08h
01h = Resource Not Available. Either the printer is configured for local use, or an outbound pacing overrun has occurred. This is a network configuration problem that should be referred to the systems programmer.
02h = Intervention Required. Either the printer is out of paper, or a paper jam has occurred. This condition is temporary and can be cleared by the remote terminal operator.
11h = Break. The operator pressed the cancel switch while the printer was in the middle of a chain of data. The chain may be restarted under host software control.
14h = Bracket Bid Reject — (RTR to Follow). The printer is temporarily busy doing a Local Copy. The printer will send an RTR command when it is no longer busy, then printing can continue.
1Ch = Request Not Executable. The requested function cannot be executed because of a permanent error condition in the printer.
31h = LU Component Disconnected. The device is powered off, or the coaxial cable is not connected to the 3270 control unit. If the ULTRA is powered on and connected, it may be necessary to power down and power up to reestablish communication between the ULTRA and the system.
