Chapter 8. Communication Functions
8-5
8.1.3 Frame structure
1) Base format
(1) Request frame
- External communication device → GM7U main unit
- Max. 256 Bytes
ENQ 16
1
16
0
Structured data area EOT
BCC
Command type
Command
Station Frame Check
Header Tale
(2) ACK Response frame
- GM7U main unit → external communication device, when receiving data normally
- Max. 256 Byte
ACK 16
1
16
0
Structured data area or null
code
ETX
BCC
Command type
Command
Station Frame Check
Header Tale
(3) NAK Response frame
- GM7U main unit → external communication device when receiving data abnormally
- Max. 256 Byte
NAK 16
1
16
0
Error code (ASCII 4Byte) ETX
BCC
Command type
Command
Station Frame Check
Header Tale
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