SATO GY412 Operator's Manual page 180

Section 7: Interface Specifications
7.5 LOCAL AREA NETWORK (LAN) ETHERNET (cont'd)
3.
1-port connection / ENQ response mode (STATUS3 / STATUS5 protocol). The print request command
received from the host computer outputs ACK. The status request command (ENQ:05H) received from the
host computer outputs the printer status.
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GY412 Operator Manual