Chapter 8. Communication Functions
8-1
Chapter 8. Communication Functions
8.1 Dedicated Protocol Communication
8.1.1 Introduction
GM7U’s built-in Cnet communication is a function to execute a dedicated communication only with a GM7U main unit. That is, it doesn’t
need a separate Cnet I/F module to facilitate the user-intended communication system by utilizing reading or writing of any area in CPU,
and monitoring function. Without additional expanses, the user can use the basic functions like read/write internal device area and
register/execute monitoring with GM7U main unit.
GM7U main unit serves as follows:
• Individual/continuous reading of device
• Individual/continuous writing of device
• Reading CPU status
• Monitor devices registration
• Executing monitoring
• 1:1 connection (link between GM7Us) system configuration (GM7U main unit: RS-232C)
GM7U built-in communication function supports Cnet communication without any separate Cnet I/F module. It must
be used under the following instructions.
1) Channel 0 of GM7U main unit supports 1:1 communication only. For 1:N system having master-slave Format, use RS- 485
communication in channel 1 or GM7U main unit with G7L-CUEC module connected. G7L-CUEC module supports RS-
422/485 protocol.
2) RS-232C communication cable for GM7U main unit is different from RS-232C cable for GMWIN in pin
arrangement and from the cable for Cnet I/F module, too. The cable can’t be used without any treatment. For the
detailed wiring method, refer to 8.1.2.
3) Basic items like baud rate type and station no. can be set in GMWIN.
REMARK
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