Avalue EBM-QM87U - Manual (Page 23)

User ’s Manual
EBM-QM87U User’s Manual 23
2.3.11 Serial port 2 connector (JCOM2)
RS-232 Mode
Signal PIN PIN Signal
NRXDB# 2 1 NDCDB
NDTRB# 4 3 NTXDB
NDSRB# 6 5 GND
NCTSB# 8 7 NRTSB#
NC 10 9 NRIB#
RS-422 Mode
Signal PIN PIN Signal
485TXP 2 1 485TXN
485RXN 4 3 485RXP
NC 6 5 GND
NC 8 7 NC
NC 10 9 NC
RS-485 Mode
Signal PIN PIN Signal
485TXP 2 1 485TXN
NC 4 3 NC
NC 6 5 GND
NC 8 7 NC
NC 10 9 NC