在CPU的一个槽内安装一块合适型号的通信板，CPU就可以增加RS232C，RS422，或RS485端口
C200H-OC226N
C200H-ME432
C200HW-PA204S
C200H-CN131
C200H-KS01G
C200HW-ATT33
C200HW-BC081-V1
C200HW-PA209R
C200H-ID212
C200H-PAR-PTC219
C200HW-ME32K
C200H-CT002
C200H-OD217
C200HW-PD024
C200HW-DRT21
C200H-FZ001
C200H-PS211
C200H-RM201
C200H-PAR-MRK1031G
C200HW-SRM21-V1
C200H-OD21A
C200HG-CPU63-ZE
C200HW-PRM21
C200H-ID111
C200H-ASC31
C200H-CN711
C200HX-CPU34-E
C200HW-SLK13
C200H-MC221
C200HW-PA204R
C200H-CN001
C200H-BC051-V2
C200H-ID218
C200HW-AB001
C200HW-ATT54
C200H-BC031-V2
C200H-LK401
C200H-MR832
C200H-CN002
C200H-OA221
C200H-TS102
C200H-TS001
C200H-TV001
C200HE-CPU32-E
C200H-IA122
C200H-TV002
C200H-MD215
C200H-CPU03
C200H-B7AI1
C200H-TC001