DECSFC—Select Flow Control
Select a flow control scheme for the communication port or printer port.
Format
| CSI 9/11 |
Ps1 3/n |
; 3/11 |
Ps2 3/n |
; 3/11 |
Ps3 3/n |
; 3/11 |
Ps4 3/n |
* 2/10 |
s 7/3 |
Parameters
Ps1
determines which port is to be assigned the flow control scheme.
| Ps1 | Port Type |
|---|---|
| 1, 0 or none | Comm Port |
| 2 | Printer Port |
Ps2
indicates the flow method. On the VT510, the transmit side or the receive side of
the communication line can select different or the same flow control methods.
| Ps2 | Transmit or Receive |
|---|---|
| 1, 0 or none | Transmit |
| 2 | Receive |
| 3 | Transmit and Receive |
Ps3
is for the flow control type. When the terminal is in PCTerm mode, XPC replaces
XON/XOFF on the receive side.
| Ps3 | Flow Control Type |
|---|---|
| 1, 0 or none | XON/XOFF or XPC (XPC is for receive only) |
| 2 | DTR |
| 3 | Both |
| 4 | None |
Ps4
sets the flow control threshold.
| Ps4 | Flow Control Threshold |
|---|---|
| 1, 0 or none | Low (64) |
| 2 | High (768) |
The terminal uses "low" and "high" to denote the flow control threshold.
- If Low is selected, then the terminal sends an XOFF (if in software flow control) or lower DTR (in hardware flow control) to notify the host of holding transmission when the input buffer reaches 64 bytes.
- If High is selected, then 768 bytes is the flow control threshold.
"High" flow control threshold is not available for the printer port, which always uses low (64 bytes) as the flow control threshold.