Toshiba GR-200-5 Instruction Manual

Also see for GR 200 Series: Instruction manual Instruction manual Instruction manual Instruction manual Instruction manual

6F2T0207 (0.01)GRE200 (5,6)- 923 -Figure 11.4-7 Message frame over Data linkAddress field of IED device:The IEDs’ identifiers are set by setting [MODBUS_ADDR]. They have to be aunique number. Each can be selected among 1 - 247.The [MODBUS_ADDR] has a default setting address (see section 11.4.10).Function code field:It is a query/response command code and is transferred over the network. Thefeatures are summarized in Table 11.4-3:Data field:It is a container for the query/response command message. The message includesa content length, inner addresses, status, function responses, etc.CRC check:The message is secured by cyclical redundancy check method (CRC). The CRCvalue is in 16-bits.Silent interval“T1–T2–T3–T4” is a silent one. Figure 11.4-7 shows that it is added at the startand the end. The silent one is 3.5 character times (at least), and it is multipliedby the baud rate.(iii) Physical frame (Parity error check)A party error check is added for the RTU frame. It is even parity or odd parity.The symbols of 1-bit of the RTU frame is counted, and a parity bit (0 or 1) isgenerated depending on the counting.