Sam4s NR-500R Service Manual page 14

2 Product Specifications
2-5 A-(g) H/W Flow Control Timing
When DTR/DSR flow control is select, before transmitting a data, the ECR checks whether the host is BUSY
or not.
If the host is BUSY, ECR does not transmit a data to the host. If the host is not BUSY, ECR transmits a data to
the Host. The host is the same. Refer to the Interface Part of Chapter 7(Special Circuit Diagrams).
2-5 A-(h) S/W Flow Control Timing
When XON/XOFF flow control is selected, the ECR transmits XON(ASCII 11h) or XOFF(ACSII 13h) signal
through the Serial Data Line. If the ECR is busy, the printer transmits XOFF(ASCII 13h) to host through the
Serial Data Line. Then the host recognizes that the ECR is busy. So, the host does not transmit a data to the
ECR. If the ECR is released from busy, the ECR transmits XON(ASCII 11h) to host through the Serial Data
Line. Then the host recognizes that the ECR is not busy. And the host transmits a data to the ECR.
2-8 SAM4S NR-500 SERIES