The case of one of the joint
RS232 can achieve two-way transmission, full-duplex communications highest transfer rate of 20kbps
422 can do one-way transmission, half-duplex communication, the maximum transfer rate of 10Mbps
485 two-way transmission, half-duplex communication, maximum transfer rate of 10Mbps
Bo Shika (232 to 422, or 485)
NOTE:
232 to ground
422 and 485 are differential, may not be grounded
