Patton electronic ONSITE 2800 - Manual (Page 131)

Sync serial port 131
OnSite 2800 Series User Manual D • Port pin-outs
X.21 serial port
Note Pins not labeled are not used.
Table 18. X.21 Female DB-15 connector
X.21 Interface Pin-Out
Pin Signal
1 Frame Ground
2 TD-a
3 CNTRL-a
4 RD-a
5 IND-a
6 SET-a
8 Signal Ground
9 TD-b
10 CNTRL-b
11 RD-b
12 IND-b
13 SET-b