Serial Parameters

Serial Parameters

Xmodem is a simple send-and-wait-for-response protocol using a fixed- length data field. The data field is embedded in an Xmodem packet, which also contains a packet number and a single-byte arithmetic checksum. The protocol link is established by the receiver transmitting a NAK character until the sender responds. The sender responds by transmitting an Xmodem packet. The sender then waits for either an ACK signal, in which case it transmits the next packet, or a NAK signal, in which case it retransmits the packet. Once all packets are transmitted, the sender transmits an EOT signal, indicating the end of transmission.

Scan the following bar code to set a portable to use the Xmodem protocol:

protocol

XModem *$+$-CA02EE*

User’s Guide

69

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PSC PT2000, TopGun manual XModem *$+$-CA02EE, protocol, User’s Guide, Serial Parameters