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

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222 Chapter8

Intrinsics Reference

FDEVICECONTROL

The DTC sets the inter-byte timer to the time it takes

to transmit 2 characters at the current baud rate (see

parm1 = 3). The read returns with all characters

received with less than a 2 character delay between

them. This ensures that the read included all of the

automatically generated escape sequence characters.

Because the DTC uses the inter-byte timer to time the

read termination, this control directive is incompatible

with the Inter-Byte Timer (parm1 = 65). If both are

enabled, the second FDEVICECONTROL will return

an error.

A buffer value of 1 enables escape sequence read

termination. A buffer value of 0 disables escape

sequence read termination.

If this directive is issued against a terminal connected

via PAD or DTC Telnet, this call will return a CCE

condition code, but the device control action will not

occur. This directive is not supported for VT

connections from an MPE V or HP-UX local client and

will return an error if used. Also, this directive is

supported for VT connections to an MPE/iX host or PC

running appropriate software only.

69 Suppress echo of read termination characters.

This directive causes the DTC not to echo read

termination characters to the terminal. This directive

is particularly useful with special AEOR characters

which may make cursor positioning uncertain. (For

example, you might use a “?” character as a help

request.)

If buffer is 1, the DTC does not echo read termination

characters (EOR and all AEOR characters). If buffer is

0, the DTC echos all characters according to the setting

of the Set Echo at Terminal control directive

(parm1 = 4).