NEC LCD Monitor, Manual

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23. LAN MAC Address
23.1 LAN MAC Address Read
This command is used in order to read the MAC Address.
1) The controller requests the monitor to read MAC Address
Header Message Check code Delimiter
SOH-'0'-Monitor ID-
'0'-'A'-'0'-'8'
STX-'C'-'2'-'2'-'A'-
‘
0
’
-
‘
2
’
-ETX BCC CR
Header
SOH (01h) : Start of Header
'0' (30h) : Reserved
Monitor ID : Specify the Monitor ID from which you want to get status.
Ex.) If Monitor ID is '1', specify 'A'.
'0' (30h) : Message sender is the controller.
'A' (41h) : Message Type is "Command".
'0'-'8' (30h, 38h) : Message length is 8 bytes.
Message
STX (02h): Start of Message
'C'-'2'-'2'-'A': LAN read command.
‘
0
’
-
‘
2
’
: MAC Address
ETX (03h): End of Message
Check code
BCC: Block Check Code
Refer to the section 4.5
“
Check code
”
for a BCC calculation.
Delimiter
CR (0Dh): End of packet
2) The monitor replies MAC Address to the controller.
Header
SOH (01h): Start of Header
'0' (30h): Reserved
'0' (30h): Message receiver is the controller.
Monitor ID: Indicate a replying Monitor ID.
Ex.) When this byte is set to 'A', the replying Monitor ID is '1'.
'B' (42h): Message Type is "Command reply".
LN(H)-LN(L): Message length (byte length), from STX to ETX
Message
STX(02h):Start of Message
'C'-'3'-'2'-'A': LAN read reply command.
‘
0
’
-
‘
2
’
: MAC Address
RC: Reply result Code
'0'-'0' (30h, 30h): Normal
'F'-'F' (46h, 46h): Abnormal
IPV: IPv4 or IPv6
'0'-'4' (30h, 34h): IPv4
'0'-'6' (30h, 36h): IPv6
MAC(0-n): MAC Address
In the case of IPv4 -> n = 4
Header Message Check code Delimiter
SOH-'0'-'0'-Monitor ID-
'B'-LN(H)-LN(L)
STX-'C'-'3'-'2'-'A'-RC-'0'-'2'-
IPV-MAC(0)-....-MAC(n)-ETX
BCC CR