Verilink AS100 (896-502379-001) Product Manual Manuel d'utilisateur télécharger pdf (Page 92)

6-18 Access System Centum Series User Manual

Printer Port Flow Control

The Centum Series port supports simultaneous hardware and software

flow control signaling from the attached device. The hardware control is

RTS if connected directly to a printer or CD if connected via a modem.

The software control is XOFF/XON. The XOFF is DC-3

(Cntl-S); however, any character arriving at the port is treated as an XO

(to protect against a damaged DC-1).

Hardware control has priority: If RTS (or CD) is low, transmission to the

device will be suspended and the data will be buffered in Centum Series.

Receipt of software flow control characters while RTS (or CD) is low will

have no effect on the port. Transmission will be resumed when RTS (or

CD) goes high.

If the port receives an XOFF while RTS (or CD) is high, transmission will

be suspended and the data will be buffered. Transmission will be

resumed if any subsequent character (including another XOFF) is

received or

if RTS (or CD) is lowered and subsequently raised. This

mechanism protects against a “lost” XON.

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Verilink AS100 (896-502379-001) Product Manual Manuel d'utilisateur Page 92