Yaskawa MEMOCON GL120 - Manual (Page 205)

4.4 Communications Modules
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Item Specifications
PC Link Port Specifications Topology
(Communications
Network)
Bus
Media Access Control
Method
Token passing (n:n communications)
Media (Transmission
Medium)
Coaxial cable (75Ω)
Modulation Method Base band
Encoding Method Manchester code
Baud Rate Choose from 0.5/1/2/4 Mbps
Transmission Distance Transmission distance varies according to the baud rate
and specifications of the coaxial cable. If, for example,
the baud rate is 4 Mbps and a 12C-5AF Coaxial Cable is
used, it is possible to transmit up to 1 km max.
Number of Stations 32 stations max.
A total of 32 PC Link Modules can be connected,
including the local one.
Error Measures (RAS) Automatic parallel off and malfunctioning station
recovery
Synchronization Method Frame
Communications Format Conforms to HDLC.
Insulation Method Pulse transformer
Connector BNC connector
MEMOBUS Port Specifications Communications Method Half-duplex stop-start synchronization p
Transmission Levels Conform to RS-232C
Protocol MEMOBUS protocol
Baud Rate 9,600 bps (fixed)
Communications Mode RTU mode
Data Format 1) Data bit length: 8
2) Parity check: Yes
3) Parity: Even
4) Stop bits: 1
Slave Address Between 1 and 32. The station address of the PC Link
Module is the MEMOBUS slave address.
Transmission Distance 15 m (Can be extended to 4.5 maximum by using
Yaskawa modem.)
Transmission Error
Detection
CRC-16
Connector D-sub connector (9-pin, female)
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