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8 Connector Deﬁnitions

8.3 DB78 female

This common connector is for eight serial ports. So each signal name appears eight times, it will

have an index like (3) for the third serial port of the card. The serial ports are neither isolated nor

isolated from each other, so GND is common and has no index. “.nc” is a no-connect pin.

Figure 30: DB78 female Connector

The description is split in two tables, instead of one common. The ﬁrst table 17 is for the RS 485

signals. “no-connect” and signals not useful in these modes are not shown to make the table shorter.

The second table 18 deﬁnes the signal assignment for RS 232 and RS 422 modes, as well as GND

and “no-connect”.

Pin RS 485 “4w” RS 485 “2w” Pin RS 485 “4w” RS 485 “2w”

1 Rx− (8) 40 Rx+ (5)

2 Rx+ (6) 43 Tx− (5) Data− (5)

3 Rx− (6) 46 Tx+ (7) Data+ (7)

6 Tx− (8) Data− (8) 48 Tx− (7) Data− (7)

8 Tx+ (6) Data+ (6) 49 Rx− (1)

10 Rx+ (4) 50 Rx+ (2)

11 Rx+ (3) 52 Rx− (4)

13 Rx− (3) 55 Tx+ (1) Data+ (1)

17 Tx+ (2) Data+ (2) 56 Tx+ (4) Data+ (4)

18 Tx− (4) Data− (4) 61 Rx− (7)

22 Rx− (5) 63 Rx+ (7)

23 Tx− (6) Data− (6) 64 Rx+ (8)

27 Tx+ (8) Data+ (8) 68 GND GND

28 Tx+ (5) Data+ (5) 69 GND GND

30 Rx+ (1) 70 GND GND

32 Rx− (2) 71 GND GND

33 Tx− (2) Data− (2) 72 GND GND

35 Tx− (1) Data− (1) 73 GND GND

37 Tx+ (3) Data+ (3) 74 GND GND

39 Tx− (3) Data− (3) 75 GND GND

Table 17: DB78 female Connector RS 485

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