Mitsubishi QJ71MB91 Communication Module Product Type : MODBUS Interface Module MODBUS Interface Unit Transmission specification interface : RS-232 1 channel RS-422/485 1 channel Transmission specification Transmission speed : 300 , 600 , 1200 , 2400 , 4800 , 9600 , 14400 , 19200 , 28800 , 38400 , 57600 , 115200 bps · The total transmission speed of the two interfaces can be used within 115,200 bps Transmission specification Transmission distance RS-232 : Maximum 15 m Transmission specification Transmission distance RS-422/485 : Maximum 1200 m (total extension distance) Master function Automatic communication function Number of communicable slaves : 32 units per channel Master function Automatic communication function Function (for transmission) : 7 Function Master function Automatic communication function Area size for input : 4K words Master function Automatic communication function Output area size : 4K words Master function Communication by dedicated command Number of concurrently executable instructions : One instruction per channel Master function Communication by dedicated command Function (for transmission) : MBRW instruction: 9 function MBREQ instruction: 19 function Master function Communication by dedicated command Area size for input : Up to 253 bytes per instruction Master function Communication by dedicated command Output area size : Up to 253 bytes per instruction Slave function Automatic response function Function (for reception) : 17 Function Slave function MODBUS device size coil : 64K point Slave function MODBUS device size input : 64K point Slave function MODBUS device size Input register : 64K point Slave function MODBUS device size Hold register : 64K point Slave function MODBUS device size Extended file register : Up to 4086 K points Slave function Number of simultaneous acceptable request messages : One request per channel Slave function Station number : 1 to 247 Number of occupied I / O points : 32 points (I / O assignment: 32 points of intelligence) DC 5 V Internal current consumption : 0.31 A External dimensions (H x W x D), approx : 9.8cm x 2.74cm x 9cm Weight : 0.2 New One Year Warranty