Specifications

Message Transmission of Data Section 5-8

5.8.1 Structure Message Header (10 bytes) Transmission of Data

Function ASCII Hex Comment

1. Byte Message 00 always 00

2. Byte identiﬁer 00 always 00

3. Byte Data direction A 41 A = Transmission

4. Byte Command D 44 D = Data block

5. Byte 2 Byte Destination Data block

6. Byte Data word

7. Byte 2 Byte number of data Number of words

8. Byte

9. Byte Coordination ﬂag number FF indicates without

10. Byte Coordination ﬂag bit FF Coord. ﬂag

The destination for data to be transmitted is always a data block.

5.8.2 Special Features of the Protocol 3964R

A write-access to data is possible in data blocks only.

I.e. only the data type DW allows a direct write-access to the respective destination.

To allow a write-access to all data yet, the data are transmitted to a deﬁned data

block, the communications block.

In this case, the destination, comprising 4 bytes, must be added in front of the data

prior to transmission.

5.8.3 Assignment of Bytes 1-4

Destination Access Data type Command Data-Number Byte-Parameter Word-Parameter

Byte 1 Byte 2 Byte 3 Byte 4 Bytes 3+4

Input Bit I 10 1 Byte Bit-No. Offset

Output Bit Q 11 1 Byte Bit-No. Offset

Flag Bit F 12 1 Byte Bit-No. Offset

Input Byte IB 1 n Bytes Offset

Output Byte QB 2 n Bytes Offset

Flag Byte FB 3 n Bytes Offset

Input Word IW 1 n Bytes Offset

Output Word QW 2 n Bytes Offset

Flag Word FW 3 n Bytes Offset

Input Word ID 1 n Bytes Offset

Output Word QD 2 n Bytes Offset

Flag Word FD 3 n Bytes Offset

HIGH-Byte DB Byte DL 26 1 Byte DB DW

LOW-Byte DB Byte DR 27 1 Byte DB DW

Counter Word C 20 n Bytes Offset

Timer Word T 21 n Bytes Offset