GIGA-TMS MSR120 Series User Manual page 22

GNET FEATURES
Support TTY (TELE TYPE) OPERATION -
Use TTY to send commands and messages.
Simple handshaking -
One enquiry one answer back.
Multi-link capability
Expandability -
GNET provides 4 major functions:
1. POLLING
2. LOGIN / LOGOUT
3. DATABASE
4. INFORMATION
Also can be expandable.
Simple format
Use ASCII value for each field and use Separator "," between two
Fields.
GNET Handshaking
ACK
TX1
RX1
GNET PACKET
STX
STX
ITEM Dec
STX
CMD Ascii
CONTENTS Ascii
CHKSUM Ascii
CR 13
REPLY (78) 65
NACK
RX TX2 RX
ACK RX2
NACK
CMD
REPLY
Hex
2 02
Ascii
Ascii
Ascii
0d
(4e) 41
NACK
TX3 RX
RX
NACK
ERR
CONTENTS
CONTENTS
Control Key
^B
Ascii
Ascii
Ascii
^M
(N) A
22
GNET
V1.2
TIME OUT
TX3 RX TX4
NO
RX3 ACK
RX4
CHKSUM
CHKSUM
Function
Start of Text
Command Code
Contents Data
Check Sum
Carriage Return
(Negative) Acknowledge
TIME
OUT
WAIT
RX
CR
CR