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Redwood City Police Department System Description i, ; Message Delivery Inbound Messages On power up of the VRM650,the data channel is accessed and the � registers itself on the system. After receiving authorization from the fixed end controller(e.g.,RNC 3000)the VRM650 is ready to send user messages. Each time the DTE ses�ds a message to the VRM650 for transmission to the host, the process of data delivery on the system will start. The data transmission will be repeated as necessary until the system either aclmowledges (Acks)the message or the VRM expends the predefined maximum number of retries. If there is no response f�om the local site (base station and controller), the message will be retransmitted four times (prograznmable) every 3 seconds (programmable). If the VRM does not receive any response from the local site, it will notify the DTE accordingly by sending a"Host Fail"message. If the VRM is set to operate in its Transparent Mode(AT commands), the VRM will enter the local mode after all retries have been exhausted. If Native Mode is selected,the decision on how to proceed after a Host Fail message is received will rest with the DTE (application). If more than one message has been sent from the DTE to the VRM , 650,these messages will be stored in the_V_RM and transmitted when the channel becomes available. This process will continue until the DTE requests the VRM to move to the local mode and stop data transmission 'Iliere will be multiple Acks or negative Acks (NAcks) sent to the DTE. The Native Mode must be used for this inbound message store and forwazd feature. In any case, all messages are backed up until delivered to the host. After a power cut off state,when the VRM is turned on again it will start transmission at the top of the buffer(assuming power has been off for less than 72 hours). It will transmit all messages that have not yet been Acked. The inbound message storage buffer is 16K bytes. If the buffer becomes full,no new messages will be accepted from the DTE until the previously received messages are transmitted. The DTE can clear the entire inbound message queue by using the proper command. Message Handling Outbound Messages All messages received from the hast will be stored until delivered , to the DTE. The number of inessages that can be stored depends �MOTOROLA . 2 - 1� . _ _ _ �_. . _ .