COM Header

There is one COM header (JCOM1) on the A4SAP-H motherboard.

For a detailed diagram of the A4SAP-H motherboard, see the layout under Motherboard Quick Reference.

COM Header

Pin Definitions: 19 Total

Pin#

RS232

RS422/485

RS485

1

SP_DCD1

TX-1

Data-1

2

SP_DSR1

 

 

3

SP_RXD1

TX+1

Data+1

4

SP_RTS1

 

 

5

SP_TXD1

RX+1

 

6

SP_CTS1

 

 

7

SP_DTR1

RX-1

 

8

SP_R11

 

 

9

GND

 

 

10

No Connection

11

SP_DCD2

TX-2

Data-2

12

SP_DSR2

 

 

13

SP_RXD2

TX+2

Data+2

14

SP_DTS2

 

 

15

SP_TXD2

RX+2

 

16

SP_CTS2

 

 

17

SP_DTR2

RX-2

 

18

SP_RI2

 

 

19

SP_GND