Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

214 Chapter8
Intrinsics Reference
FDEVICECONTROL
29 Define block mode alert character.
This directive specifies the character that signals HP
block mode transfers. The normal alert character is
DC2. Note that this call only defines the alert
character; it does not enable HP block mode. The low
order byte of buffer contains the new alert character.
If issued against a terminal connected via PAD, DTC
Telnet or VT, this call will return a CCE condition code,
but the device control action will not occur.
30, 32 Define read trigger character.
These directives specify the character the DTC sends to
trigger a read on the device. The normal trigger
character is DC1. The low order byte of buffer contains
the read trigger character. If the low order byte of
buffer contains a NUL character, there is no trigger
character.
If issued against a terminal connected via PAD, DTC
Telnet or VT, this call will return a CCE condition code
but the device control action will not occur.
36 Define backspace character.
This directive specifies the backspace character in
normal editing mode. The low order byte of buffer
contains the new backspace character.
If issued against a terminal connected via VT, this call
will return a CCE condition code but no device control
action will take place.
37 Define cancel line character.
This directive specifies the line deletion character for
normal editing mode. The low order byte of buffer
contains the new line deletion character.
[CTRL]X is the
default cancel line character.
If issued against a terminal connected via VT, this call
will return a CCE condition code but no device control
action will take place.
39 Define type 1 EOR character.
This directive specifies the EOR (End-of-Record)
character to be used in normal or transparent editing
mode. The high order byte of buffer (value*256)
contains the new Type 1 EOR character. A NUL
character disables the EOR character.
[Return] is the
default EOR character.