Black Box ME759C-RJ45, May-95 RS-232 Serial Cables and Connectors, Pinout of the RS-232 Interface

CHAPTER 4: Installation

4.4 The RS-232 Serial Cables and Connectors

The Multi-Function LD Card’s RS-232 port is always the lower port on its interface module. On ME758C models it is a standard DB25 connector (pinout shown in Table 4-1 below, top). On ME759C models it is a 10-pin female RJ-style connector (compatible with regular male RJ-45 cable connectors), pinned according to a modified version of the EIA/TIA-561 standard, as shown in Table 4-2 below (bottom).

Table 4-1. Pinout of the RS-232 Interface

DIRECTION	STANDARD RS-232/V.24 DCE PINNING			DIRECTION
		1	Protective Ground (PGND)
From Card	Transmit Clock DCE (TCC) 15	2	Transmit Data (TD)	To Card
			Receive Data (RD)	From Card
		3
From Card	Receive Clock DCE (RCC) 17	4	Request to Send (RTS)	To Card
			Clear to Send (CTS)	From Card
To Card	Local Loopback (LL) 18	5
		6	Data Set Ready (DSR)	From Card
To Card	Data Terminal Ready (DTR) 20	7	Signal Ground (SGND)
To Card	Remote Loopback (RL) 21
To Card	Transmit Clock DTE (TCT) 24
From Card	Test Mode (TM) 25

Table 4-2. Pinout of the 10-Pin RJ Interface

Pin	ITU-TSS	Signal Name/Description
Number	V.24
	Circuit
1	N/A	Not Used
2	107	DCE Ready (DCR [DSR])
3	109	Received Line Signal Detector (RLSD [CD])
4	108/2	DTE Ready (DTR)
5	102	Signal Common (SCOM [SGND])
6	104	Receive Data (RD)
7	103	Transmitted Data (TD)
8	106	Clear to Send (CTS)
9	105 or 133	Request to Send (RTS) or Ready for Receiving (RR)
10	N/A	Not Used

0 0 0 0 0 0 0 0 0 1

1 2 3 4 5 6 7 8 9 0

Pins 3 through 9 correspond to Pins 2 through 8 of the EIA/TIA-561 non-synchronous interface standard. Pin 2 corresponds to Pin 1 of the EIA/TIA TSB-25 preliminary interface standard.

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