Parity In Transmitted Or Received Data; Break Detection; Handshake Timer - HP 27130A Technical Reference Manual

HP 27130A
PARITY IN TRANSMITTED OR RECEIVED DATA
There are five parity options available for transmitted or received data:
no parity
odd parity
even parity
'0' parity
'l'parity
The first parity option generates no parity nor will it check for any parity. The character length
specified is the actual data element sent and received.
The second and third parity options cause the generation and detection of parity for the
transmitted and received data, respectively, by the SIO. An additional bit is added to the data ele-
ment for parity.
The fourth and fifth parity options clear or set the most significant bit of every character
transmitted. For the character length of 7 or 8 bits, the 7th or 8th bit, respectively, of the
character will be clear or set before the character is transmitted. On incoming characters, the
force parity bit will be stripped with no checking.
The parity option is programmed by using the WCC, SF 13.
BREAK DETECTION
The firmware notifies the host of receiving a break from the device by sending an unsolicited
event status, if enabled.
HANDSHAKE TIMER
After sending an ENQ, the firmware will wait up to the specified timeout for the ACK. If the ACK
is not received within the given time and if the ENQ retry is enabled, an ENQ will be sent again.
This will continue until an ACK is received. The default value is five seconds. The clock resolution is
one second. The timer can be programmed from 1 to 255 seconds by using the WCC, SF 18. A zero
value will defeat the timer; that is, there will be no timeout.
If enabled, a handshake timeout will generate a "handshake timed out" event.
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